函数大全(c开头)

韩冰

函数大全(c开头) 8 C; f2 ]7 _- P8 i# m0 B3 m

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函数名: cabs 4 C9 }8 d- N" S4 o功 能: 计算复数的绝对值 用 法: double cabs(struct complex z); 程序例:

#include #include

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int main(void) ; {! ^7 W( c, ^9 L( V' U" A{ " S: L( u: \7 _4 dstruct complex z; double val;

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z.x = 2.0; ! u' G, \: r; G1 ^- b+ dz.y = 1.0; + C: k7 M% a; ?! s1 L8 c$ fval = cabs(z);

printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); p# n$ _4 K5 A0 T ?8 Hreturn 0; " L7 \4 m! q) @( p: j( g}

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函数名: calloc + k1 W6 r5 F Z1 s) B9 w% O9 H3 R功 能: 分配主存储器 用 法: void *calloc(size_t nelem, size_t elsize); " V' R6 [5 T$ E/ r6 b程序例:

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#include " `6 @" R; x' O3 u; M& U#include

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int main(void) { char *str = NULL;

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/* allocate memory for string */ str = calloc(10, sizeof(char));

/* copy "Hello" into string */ 5 T& ^6 w2 w) N. Y1 Gstrcpy(str, "Hello");

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/* display string */ 5 s8 Z$ N" N$ d9 U$ W1 e( _printf("String is %s\n", str);

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/* free memory */ - a3 H- X* q1 a$ ?+ L7 afree(str);

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return 0; } ! n/ M- b2 ~9 {/ z5 M" H

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函数名: ceil * Y X- T2 H1 a/ A( a# G功 能: 向上舍入 # ^8 u, T: z$ D3 h+ M) X用 法: double ceil(double x); 程序例:

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#include 5 D4 _+ H" g3 p$ y5 d#include

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int main(void) : Z4 _3 u# l6 T! g{ . C$ D! ^" N/ ]double number = 123.54; 6 G9 B# G6 F% n' v& J4 {double down, up;

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down = floor(number); up = ceil(number);

printf("original number %5.2lf\n", number); 7 e& a' p3 }( ?: A0 k0 C/ T9 bprintf("number rounded down %5.2lf\n", down); printf("number rounded up %5.2lf\n", up);

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return 0; } $ H, s1 c4 U( {: x- L5 y

函数名: cgets ( l8 e G6 T' f6 a6 E功 能: 从控制台读字符串 ' ~) K8 S$ h+ U+ P* W用 法: char *cgets(char *str); * Q2 J; `1 I+ e i0 s8 r4 ?& A2 n程序例:

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#include #include

int main(void) { char buffer[83]; 7 S" L3 u3 ]& X/ zchar *p;

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/* There's space for 80 characters plus the NULL terminator */ - k. B2 m8 U1 C9 D- Ybuffer[0] = 81;

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printf("Input some chars:"); ! a$ P1 f0 ?$ E' Qp = cgets(buffer); printf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); printf("The returned pointer is %p, buffer[0] is at %p\n", p, &buffer);

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/* Leave room for 5 characters plus the NULL terminator */ buffer[0] = 6;

printf("Input some chars:"); ) K7 S5 O+ D/ np = cgets(buffer); " j) x: t! C0 Q8 L4 v3 j: e0 Vprintf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); 4 Y+ V2 H; M) k1 o5 ~! jprintf("The returned pointer is %p, buffer[0] is at %p\n", p, &buffer); return 0; : B2 w% h0 P7 y; x}

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函数名: chdir , J% j/ e2 t( f. H3 P功 能: 改变工作目录 用 法: int chdir(const char *path); 3 D9 p0 C* d9 }6 v% @1 d- n程序例:

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#include 0 L; @) I; g# Z7 d s5 d#include #include

char old_dir[MAXDIR]; . F" v5 a3 N* k3 \2 b h6 Lchar new_dir[MAXDIR];

int main(void) 9 ?9 i& |6 V3 m- F4 O9 @{ if (getcurdir(0, old_dir)) { perror("getcurdir()"); exit(1); Q6 t% W& j8 Q( G u} printf("Current directory is: \\%s\n", old_dir);

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if (chdir("\\")) { % v& e. J9 h1 [9 j( c, Lperror("chdir()"); exit(1); }

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if (getcurdir(0, new_dir)) 2 q4 Z, \6 {0 Z{ * V5 y" M1 u5 E; u1 Aperror("getcurdir()"); ! E" G, L0 \- Zexit(1); } printf("Current directory is now: \\%s\n", new_dir);

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printf("\nChanging back to orignal directory: \\%s\n", old_dir); if (chdir(old_dir)) { * [! ?. p: G7 Hperror("chdir()"); exit(1); & {5 }' L. m5 E s- y1 t}

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return 0; 4 f! _0 q- U% U# i* F} ) t! Y; p2 d: o

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函数名: _chmod, chmod 功 能: 改变文件的访问方式 用 法: int chmod(const char *filename, int permiss); " E y# _; q4 {9 \程序例:

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#include : U$ C/ a4 G* ^/ M' g# P" f#include 9 B9 |; w- z7 O" ~#include

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void make_read_only(char *filename);

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int main(void) * W+ W! i5 D- z7 [ ?{ 3 K! D0 j- |5 A, Zmake_read_only("NOTEXIST.FIL"); make_read_only("MYFILE.FIL"); 5 q+ o" i2 H! ^3 Ereturn 0; }

void make_read_only(char *filename) 9 [$ ]3 \' y( v J( A{ " E' U' p9 g c! j! eint stat;

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stat = chmod(filename, S_IREAD); # t6 F# o$ U0 o# i* d2 aif (stat) , h$ J# P9 W" q" `3 lprintf("Couldn't make %s read-only\n", filename); 9 N7 J& }: l/ O* nelse printf("Made %s read-only\n", filename); % D" ~; u3 f* E% Y8 j} ' e4 B" y: W5 H' P7 j* D6 a . E- T' ~) L" @

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函数名: chsize 4 f7 X$ R4 v" }1 c功 能: 改变文件大小 7 K) F n6 |% P用 法: int chsize(int handle, long size); " B' T# X# @( |" S5 @程序例:

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#include : b2 [( [) }: x. K/ u# m2 L#include . h# A0 C! h* U9 i* j8 V#include

int main(void) { int handle; 8 G$ X+ N2 ]; t7 L4 ochar buf[11] = "0123456789";

/* create text file containing 10 bytes */ % i( p+ l, p+ |! U2 Hhandle = open("DUMMY.FIL", O_CREAT); 3 y8 Q- b8 c5 _/ v* kwrite(handle, buf, strlen(buf));

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/* truncate the file to 5 bytes in size */ 7 h3 c# | Z- K8 R) ychsize(handle, 5);

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/* close the file */ close(handle); return 0; " z; f- `4 `( v. y} / N- B3 E8 f7 ^& `

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函数名: circle & I* {0 _: o" @4 g9 k, q功 能: 在给定半径以(x, y)为圆心画圆 用 法: void far circle(int x, int y, int radius); 程序例:

#include B/ L1 r! [2 a6 F#include #include #include

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int main(void) { # v" }# P: A1 b3 o( X# v/* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy; int radius = 100;

/* initialize graphics and local variables */ 1 `" @. W7 @! w: r" xinitgraph(&gdriver, &gmode, "");

/* read result of initialization */ 8 ~ n W8 ?4 ?: ferrorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { # _4 K$ P+ W" l- G1 Z: @! I4 Dprintf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); - @: ~ _# r3 J/ ? H) U/ V; egetch(); 0 e; Q2 x% l+ J7 e% Q+ M7 H# W" Iexit(1); /* terminate with an error code */ }

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midx = getmaxx() / 2; 9 k3 R+ i" E$ g8 Mmidy = getmaxy() / 2; setcolor(getmaxcolor());

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/* draw the circle */ circle(midx, midy, radius);

/* clean up */ & g! I6 k; W" H' ^" r$ Bgetch(); closegraph(); return 0; } 3 v( ^. s+ v! d! L) v/ L& T1 } 5 h3 \6 S3 R4 J! I r1 ^! }

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函数名: cleardevice ) i4 e4 ~$ r: U e3 i/ i8 |5 c4 h' N' ?功 能: 清除图形屏幕 用 法: void far cleardevice(void); 程序例:

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#include " p+ Q! U/ `' m0 v u; [9 M( u( |' L#include #include / R) O6 F! K' |, G, |/ D#include

int main(void) { 0 w6 t6 o/ U8 F: s1 _/* request auto detection */ ! | V5 [: D! ]& s* dint gdriver = DETECT, gmode, errorcode; + E- f! @" s6 n j7 `" u, c" sint midx, midy;

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/* initialize graphics and local variables */ 5 f _. _/ s& c! \0 z4 }initgraph(&gdriver, &gmode, "");

/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ 0 g: q# C7 ^# N{ printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); / ?% I9 c0 S m egetch(); exit(1); /* terminate with an error code */ ( M: m4 ]" _+ A/ Q; t}

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midx = getmaxx() / 2; midy = getmaxy() / 2; $ C) T4 J! {$ D% K8 g/ A5 M0 G+ Csetcolor(getmaxcolor());

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/* for centering screen messages */ settextjustify(CENTER_TEXT, CENTER_TEXT);

/* output a message to the screen */ outtextxy(midx, midy, "press any key to clear the screen:");

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/* wait for a key */ getch();

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/* clear the screen */ ! J9 \% ~$ |. g! e0 ~& f3 @cleardevice();

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/* output another message */ % u3 P! f( f; {outtextxy(midx, midy, "press any key to quit:");

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/* clean up */ getch(); ! h& r( s* `: B% `) Lclosegraph(); ( `4 o0 ?# P. z! A2 I, j) ]: ^return 0; }

函数名: clearerr 功 能: 复位错误标志 5 ]+ h& }" R$ i9 V7 C5 ^4 x用 法:void clearerr(FILE *stream); ) c5 d' w, |7 G: T) Q程序例:

#include

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int main(void) & ] `$ }/ R$ v" g3 x% e{ + `( C+ U& F$ Q/ F8 ~2 P6 YFILE *fp; char ch;

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/* open a file for writing */ ! a1 `0 O1 ]% I i0 O: R+ W7 kfp = fopen("DUMMY.FIL", "w");

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/* force an error condition by attempting to read */ , G5 W# P! O% y0 Dch = fgetc(fp); * V) u" X5 ~+ N6 a5 [+ iprintf("%c\n",ch);

if (ferror(fp)) " J3 q$ s! `* E; d- L F1 Q{ : \6 V- |0 _2 m( J3 W) l- y/* display an error message */ printf("Error reading from DUMMY.FIL\n");

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/* reset the error and EOF indicators */ 0 X8 ?) S4 h; `! G+ f3 f' j7 dclearerr(fp); }

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fclose(fp); : `# |) M2 d1 s3 N7 sreturn 0; " i3 s B% t7 Z" n8 m} ; c* Y! @' v/ ?" P, C- W

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函数名: clearviewport ; y7 j" ^; {( N8 D% S功 能: 清除图形视区 7 d, y4 R b; h" ?: c! n用 法: void far clearviewport(void); # v! U% J4 r. C' ~ v程序例:

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#include #include #include % m" ~+ A- C. s; @( i#include

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#define CLIP_ON 1 /* activates clipping in viewport */

int main(void) { /* request auto detection */ ! i; V6 }% C- Z8 S$ X2 hint gdriver = DETECT, gmode, errorcode; * A) [5 I7 p( d+ Q7 sint ht;

/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");

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/* read result of initialization */ 7 j, K9 a/ N: a. [' Zerrorcode = graphresult(); 3 [$ S& t( r+ B) @" }9 q: bif (errorcode != grOk) /* an error occurred */ 1 d$ k! L0 u& _3 V4 v$ J8 V{ printf("Graphics error: %s\n", grapherrormsg(errorcode)); K" r; F2 i" n# p3 o ^' C4 g9 vprintf("Press any key to halt:"); getch(); 3 X$ T* i' _* K0 P+ h4 pexit(1); /* terminate with an error code */ }

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setcolor(getmaxcolor()); & B, y' V* S% W' K& `ht = textheight("W");

/* message in default full-screen viewport */ outtextxy(0, 0, "* <-- (0, 0) in default viewport");

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/* create a smaller viewport */ setviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);

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/* display some messages */ - Z* @4 A! q2 o2 c: C8 s) Iouttextxy(0, 0, "* <-- (0, 0) in smaller viewport"); outtextxy(0, 2*ht, "Press any key to clear viewport:");

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/* wait for a key */ 9 i0 \7 l3 C* k# egetch();

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/* clear the viewport */ 3 h* I7 Y8 Q; ~clearviewport();

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/* output another message */ % \$ F+ |% `4 A9 zouttextxy(0, 0, "Press any key to quit:");

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/* clean up */ # N9 K0 w7 L; {6 h# Ugetch(); closegraph(); : C# s. ~7 z2 x4 X7 Q3 Hreturn 0; 6 z! [3 W3 e) e2 G8 A7 `5 _} 0 P. `) [" {3 D" F

函数名: _close, close 功 能: 关闭文件句柄 ' O! X! C$ Q& K$ M用 法: int close(int handle); / Z# ^* d, y3 r0 p& u# I程序例:

#include #include #include 3 ~: U( C$ `! w( l8 d& W+ |- E#include

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main() ; e# t6 X x& I! @6 d/ R6 N{ 1 A2 }$ B# r p; H4 P9 n3 vint handle; - O/ i$ \% Y1 b2 y3 jchar buf[11] = "0123456789";

/* create a file containing 10 bytes */ - b) x1 ~, w5 q$ W( X. ghandle = open("NEW.FIL", O_CREAT); 0 e+ t% Z+ U0 g0 ?. }if (handle > -1) { : H: d6 {1 d+ |; U- l- F1 L! [write(handle, buf, strlen(buf));

/* close the file */ close(handle); . E: c0 h6 O7 y% j9 ^} ! N4 {9 u' c+ ^, r9 o* _else 8 W! x0 S" h* }8 [ M1 }) i4 Z{ printf("Error opening file\n"); } ) Z' W' ^: v s! G% q" K0 Kreturn 0; * w$ d# f: z0 I8 j} / F( z8 g2 g0 O; H! N) F' H0 b- k( } # G/ T+ B4 z. N; _( m& L1 x1 o8 }. ?

函数名: clock 功 能: 确定处理器时间 用 法: clock_t clock(void); - h/ U! `, g3 O0 [程序例:

#include #include #include

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int main(void) 6 P4 y5 k+ d1 F# s9 L6 H{ clock_t start, end; start = clock();

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delay(2000);

end = clock(); ! i0 m* z& [% Q9 J# W6 w+ bprintf("The time was: %f\n", (end - start) / CLK_TCK);

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return 0; } ( I: w- M" }6 }% a- x/ }1 a7 d

函数名: closegraph 功 能: 关闭图形系统 用 法: void far closegraph(void); 程序例:

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#include ! N* D+ h7 f5 @0 F* ]#include #include #include

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int main(void) ; G( P& ?5 |, O% g. I" E& _( }{ /* request auto detection */ int gdriver = DETECT, gmode, errorcode; - N8 [2 O: N" Z3 z. i* K Vint x, y;

/* initialize graphics mode */ 4 n+ E# Q2 i, j0 F' cinitgraph(&gdriver, &gmode, "");

/* read result of initialization */ errorcode = graphresult();

if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); , f4 P/ @- a9 K; X) I2 lprintf("Press any key to halt:"); ) N' H2 T7 {1 ]1 ^$ } v- @1 lgetch(); 4 ^( R, I1 Q7 |+ F* {exit(1); /* terminate with an error code */ 3 b9 }6 l$ [6 b* Z+ W0 j' @}

x = getmaxx() / 2; * [" T3 w- j+ a- f% G8 v/ Ry = getmaxy() / 2;

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/* output a message */ ' N8 ?& u/ U9 x9 C9 d7 l% ysettextjustify(CENTER_TEXT, CENTER_TEXT); 7 z2 \7 w7 S; ~$ h$ V! G. Houttextxy(x, y, "Press a key to close the graphics system:");

/* wait for a key */ 8 H# w' S( ^, v9 egetch();

/* closes down the graphics system */ closegraph();

printf("We're now back in text mode.\n"); 0 ~3 ]& V( z8 O3 yprintf("Press any key to halt:"); getch(); return 0; } 4 E6 _+ S3 m8 e: I

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函数名: clreol 2 p8 m6 O9 h% y5 r功 能: 在文本窗口中清除字符到行末 用 法: void clreol(void); 程序例:

#include

int main(void)

{ 9 ]. D8 _% @3 C: q- `' G9 i7 Gclrscr(); 6 k: x" I, u: [, Icprintf("The function CLREOL clears all characters from the\r\n"); cprintf("cursor position to the end of the line within the\r\n"); % j$ X: o: ^) ?cprintf("current text window, without moving the cursor.\r\n"); - R& N+ ]5 q! q% I+ e. @cprintf("Press any key to continue . . ."); ) m2 E- V( K, z. a k) Qgotoxy(14, 4); getch();

clreol(); * U& W' d4 @9 b0 Cgetch();

return 0; } + Q' h/ V% [3 V7 z+ ~9 h5 j & ~2 i; _" L/ k( I

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函数名: clrscr , B0 D" t$ h6 R' I# A功 能: 清除文本模式窗口 用 法: void clrscr(void); 程序例:

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#include

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int main(void) $ s- u/ V$ i7 p! j& n+ b{ int i;

clrscr(); for (i = 0; i < 20; i++) 6 L Y6 e O* ]# `, `3 acprintf("%d\r\n", i); 8 v# [! F( q8 }/ o8 `cprintf("\r\nPress any key to clear screen"); getch();

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clrscr(); 6 O7 h1 M0 N2 z' ]8 G7 N4 r5 jcprintf("The screen has been cleared!"); ; q9 F" D* H) \- l; l$ I. }getch();

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return 0; c" C" L+ z- m$ C5 q} ! V) w& e( ?( f1 N2 o1 H1 x & j; B. U+ J {- G# E( V

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函数名: coreleft 功 能: 返回未使用内存的大小 - a& K$ e5 S0 v4 K7 T( s: [1 Q9 i用 法: unsigned coreleft(void); ) @' A. k* Q) R1 D! P# d1 O程序例:

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#include ' @7 c, y# X0 }, T* K0 c#include

int main(void) $ Q7 L8 v$ {% K% a- m8 {{ printf("The difference between the highest allocated block and\n"); * W" v# o% j( H- [printf("the top of the heap is: %lu bytes\n", (unsigned long) coreleft());

return 0; 2 `! [, C) ]2 V) S} + k) [$ S1 S: {) H2 p+ B

函数名: cos 4 x* p9 |, O$ @功 能: 余弦函数 ' q \5 W6 }/ L8 l$ ], L用 法: double cos(double x); 9 x+ E" ]( ?- T/ ^% N程序例:

#include ; K5 s; R. ~3 @#include

int main(void) { double result; 4 L9 g6 Y) J9 A% s( C: F* |double x = 0.5;

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result = cos(x); printf("The cosine of %lf is %lf\n", x, result); return 0; 9 x* D3 F8 C8 [} , L% y! _# ]% N8 K

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函数名: cosh 功 能: 双曲余弦函数 3 G% b* }5 f/ }9 x8 ~% T用 法: dluble cosh(double x); 程序例:

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#include ; ]9 `$ x9 M! @#include

int main(void) { * z1 I4 y% w; M5 }# Ydouble result; double x = 0.5;

result = cosh(x); 3 E2 ]* b8 r9 [9 A2 v3 o5 yprintf("The hyperboic cosine of %lf is %lf\n", x, result); return 0; } ) G1 Z! Q) |. O* p6 e

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函数名: country $ R/ o* A& f( W! {4 s功 能: 返回与国家有关的信息 0 ?5 d$ a0 _) D# I# M6 a' V% W [/ d用 法: struct COUNTRY *country(int countrycode, struct country *country); 程序例:

#include #include

#define USA 0

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int main(void) { struct COUNTRY country_info;

country(USA, &country_info); * S: H; q8 J8 b: T) ?4 hprintf("The currency symbol for the USA is: %s\n", * C* a1 X8 S9 }" i( ^, h2 `country_info.co_curr); 4 Z, |. k8 H) ]% m8 X0 lreturn 0; ( F, U6 W- g& L7 q} 6 s+ H" b- F4 L5 i- n 1 N+ x* w4 a$ H: H

函数名: cprintf 功 能: 送格式化输出至屏幕 H8 y" ], u' d# k用 法: int cprintf(const char *format[, argument, ...]); 0 h: s; b6 r6 V8 b3 K程序例:

#include

int main(void) 1 F* M! A: x+ A( s! A4 q }6 Y' n# T+ g{ S! C& n! O3 o. K& Q# x8 q- F/* clear the screen */ clrscr();

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/* create a text window */ : I. t( f8 P5 O2 S8 ~# E/ bwindow(10, 10, 80, 25);

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/* output some text in the window */ cprintf("Hello world\r\n");

/* wait for a key */ - o, \1 e( X3 r i: n' Tgetch(); $ Q& x- m5 }7 P# K) ireturn 0; 9 {3 V5 v* E+ ^} ) [: @! i# x2 x* q) d

函数名: cputs 功 能: 写字符到屏幕 用 法: void cputs(const char *string); 程序例:

#include

int main(void) { # J; F, N8 _) q H$ T! [1 d+ L/* clear the screen */ 9 a7 n# G% ^0 Q+ ^" v3 d: `; Pclrscr();

/* create a text window */ $ p+ A/ v" s/ r0 P) Hwindow(10, 10, 80, 25);

/* output some text in the window */ , B7 v" X8 h4 j# l; Ocputs("This is within the window\r\n");

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/* wait for a key */ getch(); return 0; 2 z% s" c" |2 A; _: M3 Y1 ~} 5 U0 ?0 r7 S4 r# G& J( k+ Q- F, L 3 C6 m, R3 C% a/ L7 c

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函数名: _creat creat / \. O0 s' J4 `1 e' l( c2 u! R0 Y' Q功 能: 创建一个新文件或重写一个已存在的文件 用 法: int creat (const char *filename, int permiss); 2 [8 R$ q3 ]2 B0 |5 Y0 R程序例:

#include " ~7 F0 v0 B( x5 F( I#include # T& G* }9 A3 [ K7 k8 a# q#include #include

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int main(void) + b6 s4 Z" J% `6 c{ int handle; char buf[11] = "0123456789";

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/* change the default file mode from text to binary */ _fmode = O_BINARY;

/* create a binary file for reading and writing */ * F; R/ H1 t* P/ W; nhandle = creat("DUMMY.FIL", S_IREAD | S_IWRITE);

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/* write 10 bytes to the file */ write(handle, buf, strlen(buf));

/* close the file */ ( I) V6 x1 R0 t, Gclose(handle); ' p! F4 D7 k0 Y' K T9 ?2 ?return 0; # J' g& p" e/ f( l8 y}

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函数名: creatnew 功 能: 创建一个新文件 用 法: int creatnew(const char *filename, int attrib); 程序例:

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#include #include 4 {3 A0 [1 q0 }' }#include #include # f n9 o3 V( r" ~' `* Y# @0 G. X#include

int main(void) 9 Q) [5 k# C( f$ q; Z! p/ X( m{ int handle; char buf[11] = "0123456789";

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/* attempt to create a file that doesn't already exist */ handle = creatnew("DUMMY.FIL", 0);

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if (handle == -1) 7 a1 @# {3 @, C) ~) c. sprintf("DUMMY.FIL already exists.\n"); else , P/ z- X2 J: N( F! \{ ; U! E9 F% X6 mprintf("DUMMY.FIL successfully created.\n"); write(handle, buf, strlen(buf)); : w" d9 S; z4 o, ^1 ]# {) g6 `) ~6 Bclose(handle); " ?/ T/ T6 n& w; s* @4 q% R} return 0; } ! \ C" s S; m) ]$ s& o" W3 }6 P & X* y c+ ~6 P$ ^5 t6 W * _) @+ q& J& _

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函数名: creattemp 功 能: 创建一个新文件或重写一个已存在的文件 , Y. ^, S0 h3 L; t& N用 法: int creattemp(const char *filename, int attrib); 程序例:

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#include #include , |. k4 q7 ^: e& H$ E( `; I( b#include

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int main(void) { int handle; w9 G _; `4 p: Zchar pathname[128];

strcpy(pathname, "\\");

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/* create a unique file in the root directory */ handle = creattemp(pathname, 0);

printf("%s was the unique file created.\n", pathname); 3 ^- p5 ~, }) X. j6 i" `close(handle); 3 K" \6 B; H/ l8 }return 0; + l% q; `* w K}

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函数名: cscanf 功 能: 从控制台执行格式化输入 用 法: int cscanf(char *format[,argument, ...]); , }* z) r5 Y( Z- z8 U6 U程序例:

#include

int main(void) { char string[80];

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/* clear the screen */ clrscr();

/* Prompt the user for input */ cprintf("Enter a string with no spaces:");

/* read the input */ cscanf("%s", string);

/* display what was read */ + q; h' G- t' Bcprintf("\r\nThe string entered is: %s", string); 0 f0 v6 e$ U- T' I$ ireturn 0; } * @% }& j8 K" u, J' g $ |" t, m9 i n: S

函数名: ctime & a) V* t0 r5 S6 x) Y( a+ e功 能: 把日期和时间转换为字符串 用 法: char *ctime(const time_t *time); * h; i' i1 [3 f9 L% e程序例:

#include #include

int main(void) {3 A( N; v5 s: z5 e) C{ 7 b- s$ v2 F% V% Y( s7 Btime_t t;

time(&t); printf("Today's date and time: %s\n", ctime(&t)); " |2 K5 A4 [9 Yreturn 0; % n9 H @2 v1 V6 L} 8 E) e6 D p, c/ L b q7 _5 j6 O" m q6 f E3 H

函数名: ctrlbrk 功 能: 设置Ctrl-Break处理程序 用 法: void ctrlbrk(*fptr)(void); 程序例:

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#include #include

#define ABORT 0

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int c_break(void) { printf("Control-Break pressed. Program aborting ...\n"); return (ABORT); }

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int main(void) { ctrlbrk(c_break); for(;;) : k* M& f6 v! o/ ^9 x- _{ printf("Looping... Press to quit:\n"); } + B( |* N2 @# @( t! |. h8 w8 vreturn 0; " k. x2 Q* Q/ Q1 Y/ q% ~}

xxb1922

这样看太痛苦了，还不如去下载一个专门查函数的软件，我就有一个

xxb1922

这样看太痛苦了，还不如去下载一个专门查函数的软件，我就有一个

zjf

[em49]

谢谢啊

chenlk

有价值！

gssdzc

还是感谢分享。。。

hjl19890710hjl

特别感谢