函数大全(c开头)

韩冰

函数大全(c开头) % B4 s3 V- `: R8 n! `- c c

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函数名: cabs 功 能: 计算复数的绝对值 用 法: double cabs(struct complex z); 4 }% l6 u' y5 p5 C程序例:

#include 4 f$ c3 A! g, w; o& L#include

int main(void) , P3 ]- @' K( b/ |! w4 K/ L{ struct complex z; ' \4 v2 c, |6 J6 v. E- U8 M/ tdouble val;

z.x = 2.0; # H5 ~8 _6 B( {! ]/ T; k7 a6 oz.y = 1.0; val = cabs(z);

printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); return 0; & A9 l3 O g: D. I: f6 U; k7 ?} . o) ^- \6 w: Y) C* T% F; T" E0 I, a % {7 ~; \! t( x0 O7 s2 f) ~6 v

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函数名: calloc 9 A3 W( q& n4 Z1 N2 J* Y功 能: 分配主存储器 - A( u1 i f6 G用 法: void *calloc(size_t nelem, size_t elsize); 程序例:

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#include % ~$ t Z, X0 @; U U+ r7 r#include

int main(void) # u; e2 r! ]( _+ t! _6 b" u; _{ char *str = NULL;

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

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/* copy "Hello" into string */ , ?. v) Y! f: q' r' r9 ostrcpy(str, "Hello");

/* display string */ 4 O$ n% D) _) }; G! Mprintf("String is %s\n", str);

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/* free memory */ % u6 i; i+ C; B0 r. qfree(str);

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return 0; }

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函数名: ceil 9 F1 o8 t0 R. b% v! a, c功 能: 向上舍入 用 法: double ceil(double x); 9 w7 B) n8 ^, j9 E8 x程序例:

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#include + f. m$ Y# B# s6 s5 l#include

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int main(void) { double number = 123.54; double down, up;

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down = floor(number); ; H" A b W" |$ E) q$ F( S3 [up = ceil(number);

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printf("original number %5.2lf\n", number); printf("number rounded down %5.2lf\n", down); 5 D; t0 G+ A; J% _! ?9 [- _$ Pprintf("number rounded up %5.2lf\n", up);

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return 0; } 0 _( K) {& d+ V! X8 N8 l& ^; S

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函数名: cgets 功 能: 从控制台读字符串 2 h8 D, G6 J2 Y用 法: char *cgets(char *str); 程序例:

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#include #include

int main(void) / n, [0 h$ I8 E. |* E/ E" @$ P{ char buffer[83]; ; H6 {, g( i d& {6 p7 ^4 Ychar *p;

/* There's space for 80 characters plus the NULL terminator */ buffer[0] = 81;

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printf("Input some chars:"); p = 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);

/* Leave room for 5 characters plus the NULL terminator */ + A" \: w3 E1 J2 [; a3 }& j" e4 mbuffer[0] = 6;

printf("Input some chars:"); 4 p; v( G) @& \8 {p = cgets(buffer); 3 i( P- J- c0 V( T; Qprintf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); 6 |5 I% \2 I, O" w) h0 `printf("The returned pointer is %p, buffer[0] is at %p\n", p, &buffer); return 0; # q* s# l+ o' ^ r} ; E. a# S5 [+ \! m

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函数名: chdir 功 能: 改变工作目录 用 法: int chdir(const char *path); ; J& @. O: S$ a. h% J! U2 p程序例:

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#include #include #include

char old_dir[MAXDIR]; char new_dir[MAXDIR];

int main(void) { % l" ^3 X' [, w* S/ ~; y" [9 D/ rif (getcurdir(0, old_dir)) 0 J, O' k7 J; h; S2 z{ * t" @+ K, D% @0 W; gperror("getcurdir()"); 5 s5 b4 S' M9 Wexit(1); } , [7 |9 r' t# e+ U( } Sprintf("Current directory is: \\%s\n", old_dir);

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if (chdir("\\")) ' y9 ?# v1 P3 p{ $ U( u0 m/ A, f3 f8 I& s; d% vperror("chdir()"); exit(1); }

if (getcurdir(0, new_dir)) 7 t. y* O5 q4 o" W/ x{ & C; z% Q% V9 z6 s& q* Gperror("getcurdir()"); 7 y( X( E% r4 O% r- x0 nexit(1); } F, W" a3 J: R% R% K! Nprintf("Current directory is now: \\%s\n", new_dir);

printf("\nChanging back to orignal directory: \\%s\n", old_dir); 5 X; [( _5 P! K8 lif (chdir(old_dir)) { 4 y6 [/ l" u: j% K# u8 Aperror("chdir()"); 3 }6 ^" V1 U. o5 j6 F, T) nexit(1); }

return 0; } 3 v4 x0 Q( @2 f; h/ G

函数名: _chmod, chmod 功 能: 改变文件的访问方式 1 y( R) d k. r; A用 法: int chmod(const char *filename, int permiss); 程序例:

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#include $ u5 t% M: T% H+ y1 |" V" D5 M; |#include 3 E" K: A2 R- l: b& Z& t#include

void make_read_only(char *filename);

int main(void) ! B: z/ L. f7 j/ r$ k$ r7 |{ " u( G+ R( O& d1 zmake_read_only("NOTEXIST.FIL"); % G$ h1 D! f7 `/ H% B9 Wmake_read_only("MYFILE.FIL"); return 0; $ e+ p( w; B9 o) _) J7 x}

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void make_read_only(char *filename) { int stat;

stat = chmod(filename, S_IREAD); ) B# a% V. j1 \3 b# _2 c/ nif (stat) ) w1 }; p0 D0 o4 I/ F% f4 pprintf("Couldn't make %s read-only\n", filename); 6 F6 I6 v3 i6 Felse printf("Made %s read-only\n", filename); . T7 P2 m5 t" t8 M7 F3 W. T( U} . F% Z% b* Q. j* j# w V$ O" ` - r U6 f9 \( [1 R. o 0 T( C$ v: m x$ n0 U, B

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函数名: chsize 1 E8 X+ k; i8 _! s$ g3 O1 {功 能: 改变文件大小 3 t" i! z4 b9 w) _- q# m用 法: int chsize(int handle, long size); 3 P v" y. u* M) {$ i程序例:

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#include ) J7 r1 l1 i9 n#include + o3 V7 [9 A6 ^#include

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int main(void) - ^! J: p8 l: r) ?) i8 s$ A{ 4 d8 p, H* l7 @. ]2 y% {int handle; " t0 f7 v& x; g! S+ Gchar buf[11] = "0123456789";

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/* create text file containing 10 bytes */ 9 t8 K3 [" A; C8 `$ P4 V2 dhandle = open("DUMMY.FIL", O_CREAT); 7 ~! m; q9 s9 o! hwrite(handle, buf, strlen(buf));

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/* truncate the file to 5 bytes in size */ + E* h' ~1 X$ b- X+ I* Q# ]chsize(handle, 5);

/* close the file */ close(handle); return 0; ' r8 I9 Q, a# P. d} & T, ^3 A/ j7 T( `" {/ h

函数名: circle 功 能: 在给定半径以(x, y)为圆心画圆 / Z, f" f; G% S( N/ m用 法: void far circle(int x, int y, int radius); + f) h. p2 q# b0 r4 e) K程序例:

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#include #include 1 `9 D6 B6 @: M#include 7 o' L3 \2 Y4 S#include

int main(void) 6 E& V: f$ ~. q% B; F: a{ 1 ^. r" I- d; \' u6 B/* request auto detection */ : J6 `; |( _3 iint gdriver = DETECT, gmode, errorcode; 8 ?: w7 o( n- I: ]% p) d' yint midx, midy; 1 c* f1 b4 d8 J( C+ w, Yint radius = 100;

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

/* read result of initialization */ errorcode = graphresult(); ' k$ j) N, b! A, s. Rif (errorcode != grOk) /* an error occurred */ 7 M4 e) u3 _/ U8 @5 H( ?{ - B m+ A/ w0 l5 |9 dprintf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); ' N0 T7 |4 H. w# @getch(); exit(1); /* terminate with an error code */ 0 ]8 Y- M5 i, s5 v# l}

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midx = getmaxx() / 2; 9 H% x: S+ y6 Mmidy = getmaxy() / 2; % } `3 s# ]1 ?6 ~' a2 x1 Z& \9 Zsetcolor(getmaxcolor());

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

/* clean up */ % T7 D. m3 t% {* j# y* Ugetch(); closegraph(); 2 i0 @/ U/ F* y6 R8 Y; u f" v5 ~$ `. nreturn 0; } 4 [* x) ?; V. { ( }7 |! k) @8 l- N8 M

函数名: cleardevice 3 p: ]. Y- k4 p' M3 O1 l L功 能: 清除图形屏幕 " P) I4 O7 ]' V* M$ B @用 法: void far cleardevice(void); , r( L) d9 D a1 B! T& m: [2 b+ s程序例:

#include #include #include #include

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int main(void) ( {; l& A& w8 m6 N* a& y{ 0 g. W/ b% `8 o/* request auto detection */ int gdriver = DETECT, gmode, errorcode; 0 T7 f8 S t! U. S! Hint midx, midy;

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

/* read result of initialization */ 8 E' H- Z, Q6 z& Eerrorcode = graphresult(); $ I- {6 l' e* h7 lif (errorcode != grOk) /* an error occurred */ - a% A7 e' n8 }: ^+ B7 d, K3 [{ 6 I4 J& [) J3 Xprintf("Graphics error: %s\n", grapherrormsg(errorcode)); / t, i) S% `9 U* |& j! `$ Uprintf("Press any key to halt:"); ( V S' V5 D# vgetch(); " t9 t! ]. s4 F, H1 `4 yexit(1); /* terminate with an error code */ }

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midx = getmaxx() / 2; midy = getmaxy() / 2; setcolor(getmaxcolor());

/* for centering screen messages */ + Y9 n* ~, z! R5 G* C& C+ b/ Bsettextjustify(CENTER_TEXT, CENTER_TEXT);

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/* 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();

/* clear the screen */ ' U2 ^* Y5 C. }% P ecleardevice();

/* output another message */ 8 y2 d7 l2 ]: mouttextxy(midx, midy, "press any key to quit:");

/* clean up */ 7 ]% g) R+ Q: v; |getch(); & `, y4 f! D/ V+ V fclosegraph(); return 0; } 2 D1 v) \2 q1 ?" Q1 @& j . W1 Y, r% `1 Y) v" r: Y: z

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函数名: clearerr 功 能: 复位错误标志 5 v J$ x" Z. I6 o. l. v* q用 法:void clearerr(FILE *stream); 程序例:

#include

int main(void) { FILE *fp; char ch;

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/* open a file for writing */ 1 Y0 E5 r( h! P& | `* bfp = fopen("DUMMY.FIL", "w");

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/* force an error condition by attempting to read */ 4 n8 @' h3 e1 ^2 hch = fgetc(fp); printf("%c\n",ch);

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if (ferror(fp)) { /* display an error message */ : t9 n8 Y/ ~" o# A1 b' M' j6 Dprintf("Error reading from DUMMY.FIL\n");

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/* reset the error and EOF indicators */ 1 h7 g( [! z9 x: ~! wclearerr(fp); : B2 E" ]! m0 Z+ _( E/ n0 T}

fclose(fp); return 0; # a! ]) w9 A# l; ~ W) L) s} & s* D& |5 Y5 R1 F7 a( y ( r8 [: z/ H# J; }# ^5 G5 ]% o

函数名: clearviewport - J ^. I) ?- b* n0 O! @功 能: 清除图形视区 用 法: void far clearviewport(void); 5 y2 B9 P$ s; H5 d程序例:

#include #include , N$ } x" a" P4 a( ]#include , F, u2 z o/ m- ]; A* s3 {#include

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

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int main(void) { /* request auto detection */ . U! B2 o: E# tint gdriver = DETECT, gmode, errorcode; % T/ ^4 U# r! r0 F) y' mint ht;

/* initialize graphics and local variables */ \% j! [" c% [/ v9 t& c% ginitgraph(&gdriver, &gmode, "");

/* read result of initialization */ errorcode = graphresult(); , x$ _6 ~8 q8 ~( [: kif (errorcode != grOk) /* an error occurred */ { ( N+ [' M! Q7 g/ P/ S! m @% dprintf("Graphics error: %s\n", grapherrormsg(errorcode)); * s' a! R* Y( }printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }

setcolor(getmaxcolor()); 1 A6 F. t/ M: ?+ j1 bht = textheight("W");

/* message in default full-screen viewport */ $ n4 b# W ]" }* x5 D/ Y6 touttextxy(0, 0, "* <-- (0, 0) in default viewport");

/* create a smaller viewport */ * G6 z0 [- h. d9 F) ~5 c2 R. usetviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);

/* display some messages */ ' H$ ]2 {0 z. }% |. L- Vouttextxy(0, 0, "* <-- (0, 0) in smaller viewport"); 1 Y7 o" V* N, q8 Eouttextxy(0, 2*ht, "Press any key to clear viewport:");

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

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/* clear the viewport */ clearviewport();

/* output another message */ outtextxy(0, 0, "Press any key to quit:");

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/* clean up */ getch(); # j* }3 H ~& Rclosegraph(); return 0; 0 e* j& X4 Z, N- A4 S# {0 I: P3 I4 W}

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函数名: _close, close 功 能: 关闭文件句柄 % @: h( D5 |. L O5 ?用 法: int close(int handle); 程序例:

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#include * X+ y4 a0 z+ K; o+ W#include #include #include

main() { - P$ |& Y! M9 \ p7 U5 |int handle; 4 b# o5 Z4 @% jchar buf[11] = "0123456789";

/* create a file containing 10 bytes */ 5 X' N0 ~& c0 ?handle = open("NEW.FIL", O_CREAT); # y) T, T& Q- ^6 Vif (handle > -1) - M; `- f2 k7 f W t: A) i( _& _{ # e+ [* I2 C0 m, e: K6 dwrite(handle, buf, strlen(buf));

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/* close the file */ + y! ]' h( j* u3 a3 O2 Lclose(handle); } else - a: f& E' r3 ] a9 R: `{ printf("Error opening file\n"); / @" k7 G9 Z- P) Y1 y} 2 x8 p3 R" B% g% C- rreturn 0; / D+ |+ d |# n2 R0 \# X} / C- E* {7 G) d6 O& K6 V j # Y+ H. L' `9 U+ N$ |- m

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函数名: clock 功 能: 确定处理器时间 用 法: clock_t clock(void); 程序例:

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#include + v% J7 S/ s* @3 [) Z" s" `#include ) R% k: S- y% K$ T! h# W/ ~#include

int main(void) , \2 n/ \7 u A) }{ " E8 ^1 v. r- z4 E4 F& R( Nclock_t start, end; start = clock();

delay(2000);

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end = clock(); : f x0 c9 R, g+ f% _5 _! xprintf("The time was: %f\n", (end - start) / CLK_TCK);

return 0; } ! @7 q5 S' i! J x

函数名: closegraph 功 能: 关闭图形系统 ) D# O/ t" a# N$ d% F+ @3 V+ n用 法: void far closegraph(void); ( G! o6 d7 r. h程序例:

#include {, t% k, l$ t* n2 Y#include " P8 g5 X3 J3 k; A#include . q$ r/ I8 Y1 c6 P6 _#include

int main(void) / K2 x% A5 ^6 N8 r- `{ ' I/ Q( q# j4 f1 `% ~/ E/* request auto detection */ ' f4 S% P' Z: `; Cint gdriver = DETECT, gmode, errorcode; int x, y;

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/* initialize graphics mode */ initgraph(&gdriver, &gmode, "");

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/* read result of initialization */ $ p0 ?9 `3 X8 O* T' \" verrorcode = graphresult();

if (errorcode != grOk) /* an error ' Y- [& C" B2 e( Y X2 b# V: \8 Doccurred */ + w5 b) x- o, i' v0 I& Q{ ' [: P7 i' O8 ?) B+ |, P! c% dprintf("Graphics error: %s\n", grapherrormsg(errorcode)); 0 z: ~4 i5 L" g& [printf("Press any key to halt:"); getch(); 1 M; G4 c1 Z! W+ z3 Dexit(1); /* terminate with an error code */ }

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x = getmaxx() / 2; 7 g/ c8 }0 \. h6 ey = getmaxy() / 2;

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/* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); 3 V) j5 @' [) S& couttextxy(x, y, "Press a key to close the graphics system:");

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

/* closes down the graphics system */ 4 X. c& r5 y+ G3 Kclosegraph();

printf("We're now back in text mode.\n"); / e$ e' F$ u4 J; [printf("Press any key to halt:"); getch(); 6 ]( H- k9 C% T9 d% \- nreturn 0; } ' U" t! a# c& O9 m

函数名: clreol 功 能: 在文本窗口中清除字符到行末 用 法: void clreol(void); 程序例:

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#include

int main(void)

{ clrscr(); cprintf("The function CLREOL clears all characters from the\r\n"); cprintf("cursor position to the end of the line within the\r\n"); 9 ^7 u8 c- M6 m- O, Dcprintf("current text window, without moving the cursor.\r\n"); cprintf("Press any key to continue . . ."); 5 @; ^- V# F+ |" }* P- Dgotoxy(14, 4); getch();

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clreol(); I- X% S! f7 o2 u: E% H5 Mgetch();

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return 0; " R4 R6 ]4 |: O7 p} . r# f3 k. p0 ?% w5 g2 S, i ( J4 L7 L' n) B8 y8 B

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函数名: clrscr 功 能: 清除文本模式窗口 用 法: void clrscr(void); # k0 F5 k2 D+ c. r5 i程序例:

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#include

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int main(void) { int i;

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clrscr(); for (i = 0; i < 20; i++) ) |8 P3 \2 n3 l3 V; ucprintf("%d\r\n", i); + W- S$ b9 S o0 c1 Hcprintf("\r\nPress any key to clear screen"); getch();

clrscr(); cprintf("The screen has been cleared!"); getch();

return 0; } ) T; @6 X- r/ W4 u; D0 e; } 6 X# s- u& Y# @+ X/ J( A

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函数名: coreleft 5 [0 G% }$ g) t, q功 能: 返回未使用内存的大小 用 法: unsigned coreleft(void); 程序例:

#include % S$ N0 X) ?3 y% y& o: c#include

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int main(void) { 6 l$ E+ R& Q0 L1 n0 M$ T4 h2 b5 gprintf("The difference between the highest allocated block and\n"); $ \3 L$ M7 ]8 a; Tprintf("the top of the heap is: %lu bytes\n", (unsigned long) coreleft());

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return 0; ' Z$ K! v& _/ G* v, }5 M* Y* b} . P6 ?9 g; h, J$ {% Q) F# D

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函数名: cos 功 能: 余弦函数 用 法: double cos(double x); 程序例:

#include $ T1 X2 M0 S; C/ a+ `#include

int main(void) 1 _; ~$ ^2 G; ?7 T, h; d7 T8 F/ S{ double result; 5 P) I2 G0 }8 W3 W* |' bdouble x = 0.5;

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result = cos(x); printf("The cosine of %lf is %lf\n", x, result); ) g6 Q6 \# j2 t. S$ q6 a1 h Hreturn 0; & s, V- ? I0 f& z} ( l3 @: Z& b" Q 3 }8 b r7 X9 C3 T

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函数名: cosh : l1 m, M R8 h; J: [功 能: 双曲余弦函数 用 法: dluble cosh(double x); 9 ]/ C5 o& [ \% O" l程序例:

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#include #include

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int main(void) { : H% K4 s+ F: ]8 Mdouble result; double x = 0.5;

result = cosh(x); / J9 s9 B1 ^) \printf("The hyperboic cosine of %lf is %lf\n", x, result); 9 c; H/ o! ]- g4 t! C& F5 x! Xreturn 0; " t0 W' |4 y( s4 o}

函数名: country 功 能: 返回与国家有关的信息 用 法: struct COUNTRY *country(int countrycode, struct country *country); 程序例:

#include #include

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#define USA 0

int main(void) { 0 L9 V* w. A# U' I- p2 Rstruct COUNTRY country_info;

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country(USA, &country_info); printf("The currency symbol for the USA is: %s\n", country_info.co_curr); return 0; $ n) Q; t6 N ]} : q6 Y& Z2 o+ n0 {* ^ 5 t5 M- h; i- e2 P

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函数名: cprintf 功 能: 送格式化输出至屏幕 用 法: int cprintf(const char *format[, argument, ...]); ! ?% j9 p( o& a程序例:

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#include

int main(void) 9 o0 U' H: u0 B% `{ ! U0 P- N) C0 w2 V7 {* H/* clear the screen */ - E2 K* E. }# u- oclrscr();

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/* create a text window */ window(10, 10, 80, 25);

/* output some text in the window */ ) `5 W& A/ q5 _) m, y3 y2 z$ |cprintf("Hello world\r\n");

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/* wait for a key */ getch(); return 0; 1 S# f* U3 s% M4 r} % S% a3 L" S: m7 Y+ }# a ! [4 Q- }) w4 \; u! l* x" b

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函数名: cputs " y6 k/ v, Y& \9 k0 o4 b/ I7 h- K功 能: 写字符到屏幕 用 法: void cputs(const char *string); 2 V# t7 _/ z" x3 K3 ^; i程序例:

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#include

int main(void) { & `5 E2 {5 V3 p% N* R2 ]7 l/* clear the screen */ clrscr();

/* create a text window */ & V0 @$ z% O2 fwindow(10, 10, 80, 25);

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/* output some text in the window */ cputs("This is within the window\r\n");

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/* wait for a key */ getch(); 7 J+ x; s/ x4 M6 _return 0; } ( a$ _ K+ }$ ]

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函数名: _creat creat 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); 3 u7 D+ e! j* X9 \3 c' y程序例:

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#include #include #include #include

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int main(void) . [% U9 G0 ~; W{ ' Y5 [* Z' J& fint handle; ) ~% ]# v ~+ I8 E# i. jchar buf[11] = "0123456789";

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/* change the default file mode from text to binary */ % I% D$ x8 m, x6 R. ~_fmode = O_BINARY;

/* create a binary file for reading and writing */ : r. y' i" s( a# u0 U! ghandle = creat("DUMMY.FIL", S_IREAD | S_IWRITE);

/* write 10 bytes to the file */ 3 {1 I6 d( d5 r( p* Nwrite(handle, buf, strlen(buf));

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/* close the file */ close(handle); 4 m0 V( G+ b7 m1 ?return 0; } ) }6 x2 C1 O, f; U

函数名: creatnew " T5 I) e# Z! ~7 G- y* G功 能: 创建一个新文件 用 法: int creatnew(const char *filename, int attrib); 程序例:

#include ) |! g1 ~! i* ]- ^& R# W# S, h' s#include : i5 a; m. o; O1 \#include #include # n& {8 ]+ A" Y. {# y. Z S#include

int main(void) { int handle; char buf[11] = "0123456789";

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/* attempt to create a file that doesn't already exist */ + d2 p- m! W5 Whandle = creatnew("DUMMY.FIL", 0);

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if (handle == -1) ! _$ E4 W" f9 W6 h% v- _: T/ tprintf("DUMMY.FIL already exists.\n"); else { printf("DUMMY.FIL successfully created.\n"); ' J2 [" U: S& ?1 cwrite(handle, buf, strlen(buf)); close(handle); & o" l- l- b( @8 o0 n- e. k5 |; L2 n} , \$ ~3 w& w/ l. `" j+ C# sreturn 0; 3 o: t' t8 i% b# p) J$ _} % N: c( T4 O2 t: E- M5 u n# W % h$ O. w0 f2 X1 ]6 Z, x1 y4 x

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函数名: creattemp # j+ k7 f7 D3 \/ u* \# S3 j功 能: 创建一个新文件或重写一个已存在的文件 用 法: int creattemp(const char *filename, int attrib); * X9 t" d3 V& V( Y" Z+ P程序例:

#include 7 Q; y2 \* {4 p* S#include #include

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int main(void) ; U: y+ E$ i0 E5 N1 s! U X. [$ p{ 2 M0 r" ^ h" E# i, Bint handle; " z4 a, u S0 K! ~2 o# k! {char pathname[128];

strcpy(pathname, "\\");

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/* create a unique file in the root directory */ 9 r1 Q4 w9 a' y/ J7 Nhandle = creattemp(pathname, 0);

printf("%s was the unique file created.\n", pathname); 6 c E% {; L! x( a& i3 W0 C! o! ^close(handle); return 0; } 7 o {5 x2 s8 ]3 s% w5 x , ]# u/ Z: o; Q& Z- J

函数名: cscanf 功 能: 从控制台执行格式化输入 用 法: int cscanf(char *format[,argument, ...]); 程序例:

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#include

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

/* clear the screen */ " c& j5 F( Z4 X' a8 ^- r8 P0 u- i mclrscr();

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

/* read the input */ . p" ? f4 `/ u/ b r/ X, dcscanf("%s", string);

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/* display what was read */ & j1 M8 S7 g) dcprintf("\r\nThe string entered is: %s", string); 1 b. P7 q, j% F) Freturn 0; } 5 x, P5 w4 K. l3 `. t' J( R 0 n# D4 e, e$ c! x

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函数名: ctime 功 能: 把日期和时间转换为字符串 : J; a) Y' `$ \ z8 e( M+ R用 法: char *ctime(const time_t *time); ( e/ t0 g! b& P$ T, ]程序例:

#include : O R# e& l: s6 S#include

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int main(void) 6 \2 A, Y4 w& v{ time_t t;

time(&t); printf("Today's date and time: %s\n", ctime(&t)); 8 o' Y0 O, {) L* S T$ j8 k: mreturn 0; } ! A$ _7 Y! u9 |' d) s2 x5 s 9 r! O+ [- Q1 x2 k9 c8 h2 ` | 4 C+ U/ }3 X* Q( u1 n

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

#include #include

#define ABORT 0

int c_break(void) ) p% W3 Z3 g/ m! f( ]( S+ }" k{ 6 U6 f t' v$ U& ~( jprintf("Control-Break pressed. Program aborting ...\n"); ; G! t5 A# { greturn (ABORT); ) _3 t8 x8 [- i8 C6 g$ A}

int main(void) 5 p' f6 n5 C) U{ % Y* T# S/ L9 c& F) ectrlbrk(c_break); . O: c, m* f) x; Wfor(;;) 1 r5 G- L3 Y3 Q: H, {7 l; G{ 3 m9 V3 u7 N+ W0 Y+ Q) Wprintf("Looping... Press to quit:\n"); } return 0; }

zjf

[em49]

谢谢啊

chenlk

有价值！

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

gssdzc

还是感谢分享。。。

hjl19890710hjl

特别感谢