函数大全(c开头)

韩冰

函数大全(c开头) 7 N& G# Q9 H. J7 d/ M5 ?$ z' f

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函数名: cabs 9 N4 k* C- B# V3 _7 B& W" _0 }功 能: 计算复数的绝对值 + b6 s6 y+ G* i用 法: double cabs(struct complex z); 程序例:

#include 4 I! T% q/ V/ U% \" B3 H- K#include

int main(void) { struct complex z; double val;

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z.x = 2.0; - {+ [: v) N1 b5 _0 F; N, E5 Cz.y = 1.0; val = cabs(z);

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printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); $ y& ^ C! T, k& _: v0 P Ureturn 0; }

函数名: calloc 9 N/ h4 c% o. _+ D* O4 B, I功 能: 分配主存储器 ) R8 ]3 W5 W0 O- a* K0 V用 法: void *calloc(size_t nelem, size_t elsize); ) a' N7 O0 _. E7 ^. V( z程序例:

#include #include

int main(void) { % I2 Q+ q$ t' z/ L2 }/ zchar *str = NULL;

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

/* copy "Hello" into string */ % y; M0 p1 S( M* m% m' astrcpy(str, "Hello");

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/* display string */ printf("String is %s\n", str);

/* free memory */ " U' K: m) t G) Ufree(str);

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return 0; }

函数名: ceil 功 能: 向上舍入 7 D5 s! c* I* W; ~3 B0 S用 法: double ceil(double x); : q' Z3 d. L* a2 f程序例:

#include ! N( S" _ d9 v% ]# v. F#include

int main(void) { * Q9 h7 K9 C+ @ ^double number = 123.54; / f- {! P$ a! c D$ \- tdouble down, up;

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down = floor(number); ( }, s1 g1 S- {9 t* C$ |2 T( wup = ceil(number);

printf("original number %5.2lf\n", number); printf("number rounded down %5.2lf\n", down); 2 t+ C5 b# l4 n2 c6 kprintf("number rounded up %5.2lf\n", up);

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return 0; } ) _2 }. E' M+ F. |! c8 | 2 D! P/ L+ F; [/ C

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函数名: cgets " h4 l. f8 |) w: i4 U功 能: 从控制台读字符串 $ z$ O, p b9 M4 d3 u用 法: char *cgets(char *str); 程序例:

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#include #include

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int main(void) { 9 X0 N& v0 n. Y# |- X2 D, U( Gchar buffer[83]; 6 S6 @4 @# q8 y7 {/ Mchar *p;

/* There's space for 80 characters plus the NULL terminator */ 1 K+ G. G2 g) O& @5 ~buffer[0] = 81;

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 */ buffer[0] = 6;

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printf("Input some chars:"); p = cgets(buffer); 4 S6 G1 {: R) A$ I7 Z( K+ mprintf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); printf("The returned pointer is %p, buffer[0] is at %p\n", p, &buffer); return 0; } 6 u* b8 d9 _7 z" ^, L3 \4 ?

函数名: chdir 5 @$ R6 k- I2 V" k4 P9 n5 R4 [功 能: 改变工作目录 用 法: int chdir(const char *path); 程序例:

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#include & ?, a7 d) @. x8 a6 H5 d2 k% y#include / \* _2 j; w. t) y#include

char old_dir[MAXDIR]; + P$ k. j. P, |. G; uchar new_dir[MAXDIR];

int main(void) { if (getcurdir(0, old_dir)) % t+ g H" l+ ^; B! n{ perror("getcurdir()"); exit(1); } printf("Current directory is: \\%s\n", old_dir);

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if (chdir("\\")) { " n1 k( t5 [$ O7 Yperror("chdir()"); F+ y2 [. Q( B2 n- K; L, h3 hexit(1); }

if (getcurdir(0, new_dir)) 1 G6 A4 D* a) y3 o- r# k2 t{ perror("getcurdir()"); 3 y$ Q& V- |0 lexit(1); 0 ^& e3 X" H7 \+ k0 T6 P1 L} / n* X" F; _, m. D$ |printf("Current directory is now: \\%s\n", new_dir);

printf("\nChanging back to orignal directory: \\%s\n", old_dir); if (chdir(old_dir)) { perror("chdir()"); ' t% c6 u- S5 R9 N Qexit(1); 1 M3 ]' Q" A" p9 A7 e' L}

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return 0; }

函数名: _chmod, chmod % f7 W* X8 M4 T5 V功 能: 改变文件的访问方式 用 法: int chmod(const char *filename, int permiss); 程序例:

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#include 3 |' e4 P5 J- \# Y& r3 k9 Y' k#include 6 I2 l; c, N) }' b. \#include

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void make_read_only(char *filename);

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int main(void) & F% L1 v% n6 j; R" I! n' t{ . S' u0 l+ t( ] |5 V& jmake_read_only("NOTEXIST.FIL"); ' z. h0 }9 z, I: u" Bmake_read_only("MYFILE.FIL"); # `& V. p' _# C3 r, _/ x& r0 _return 0; $ e# k% M2 C+ I" ?) Z# t8 b H7 [9 e}

void make_read_only(char *filename) { int stat;

stat = chmod(filename, S_IREAD); if (stat) printf("Couldn't make %s read-only\n", filename); + V7 |& K: [2 g# X$ n1 y% C+ Nelse 5 e" n! `2 F: w3 y; G6 A3 |% pprintf("Made %s read-only\n", filename); 9 p! p; B* L/ a D} / }- h$ i9 Z- M3 ]3 p9 O" M( a

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函数名: chsize ( G/ @$ Q) @0 _7 q- v. v/ M6 o功 能: 改变文件大小 用 法: int chsize(int handle, long size); ' Q. \/ u/ d$ \9 F9 j; P程序例:

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#include / q L" T) t% t) r7 }4 f#include + `# x* ~8 \- a6 \% @ D#include

int main(void) { int handle; 9 B8 d% l% ?9 M# ]" Ochar buf[11] = "0123456789";

/* create text file containing 10 bytes */ handle = open("DUMMY.FIL", O_CREAT); write(handle, buf, strlen(buf));

/* truncate the file to 5 bytes in size */ chsize(handle, 5);

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/* close the file */ close(handle); return 0; $ ?. b. a n" e; g; @} 2 z8 y& g8 W+ w' o) }) u/ e# W

函数名: circle 功 能: 在给定半径以(x, y)为圆心画圆 4 F! f7 [+ ~/ t9 t$ t1 K8 _5 h2 Q用 法: void far circle(int x, int y, int radius); 程序例:

#include #include % M, J% B8 ~" R' l& g) O#include #include

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int main(void) 4 H* M$ q/ s+ e{ /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy; . _# J, \" `2 e: C! _int radius = 100;

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/* initialize graphics and local variables */ ; C* B- F# C2 D5 finitgraph(&gdriver, &gmode, "");

/* read result of initialization */ + M) P$ ?# r6 G( [% h' ierrorcode = graphresult(); * u& ?( n; D& X) h1 a3 B* t- k0 wif (errorcode != grOk) /* an error occurred */ ) S! l$ ^* N# K& A) {9 B6 ~{ printf("Graphics error: %s\n", grapherrormsg(errorcode)); / D$ y8 R) j O; R. @7 Iprintf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }

midx = getmaxx() / 2; midy = getmaxy() / 2; ' R) a* M4 Y! |8 _setcolor(getmaxcolor());

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/* draw the circle */ 0 x, F' b& ?0 @! l) }2 kcircle(midx, midy, radius);

/* clean up */ getch(); closegraph(); return 0; ! _) V8 ?! ^ k% K' K5 p} 6 m0 a& C3 _- H* o8 @ : n. ^/ m8 v/ g$ p

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函数名: cleardevice 3 g- i: Z! V! Q0 U功 能: 清除图形屏幕 % h8 w8 b5 i* M" C O n用 法: void far cleardevice(void); 程序例:

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#include #include 4 J6 ^: n, F4 z- P! V/ `! N& O#include 2 Z7 _! z6 N0 z6 a: e#include

int main(void) 4 @9 A7 O/ O: i7 l a" }5 T( T{ /* request auto detection */ int gdriver = DETECT, gmode, errorcode; " U8 ~/ |& J# b5 _$ Oint midx, midy;

/* initialize graphics and local variables */ 5 f0 a4 ` G' j. M% d% H5 ainitgraph(&gdriver, &gmode, "");

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/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { ' G; M# W# H: {0 `: uprintf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); , M2 g6 {( \) B% L- C' f& Y% W" Lexit(1); /* terminate with an error code */ 1 f" [/ J+ j6 r! [$ `6 x}

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

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

/* output a message to the screen */ 4 J" i' S s6 k5 _6 Kouttextxy(midx, midy, "press any key to clear the screen:");

/* wait for a key */ 2 p' p5 d, J6 ` G2 `getch();

/* clear the screen */ cleardevice();

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/* output another message */ outtextxy(midx, midy, "press any key to quit:");

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/* clean up */ getch(); closegraph(); return 0; " X0 S7 K! C, M6 w+ w4 V} ; o% T* T5 H9 n4 z0 ]- [0 q / W. n7 y3 C' P% B1 Q7 I6 O

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函数名: clearerr 功 能: 复位错误标志 7 Y9 r. E# Z1 q! a! D" a用 法:void clearerr(FILE *stream); 6 I. A( E( n/ R2 W; ]0 y" b1 u程序例:

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#include

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

/* open a file for writing */ fp = fopen("DUMMY.FIL", "w");

/* force an error condition by attempting to read */ ch = fgetc(fp); printf("%c\n",ch);

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if (ferror(fp)) { /* display an error message */ printf("Error reading from DUMMY.FIL\n");

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/* reset the error and EOF indicators */ ( O' h- G! L% @8 w# b, ~. xclearerr(fp); ) U5 [8 H. X( _4 K$ E1 m7 `}

fclose(fp); 6 n$ P% I1 H2 m' r( o- D* _return 0; } 1 q$ \; S& a5 L% A8 Z

函数名: clearviewport 功 能: 清除图形视区 用 法: void far clearviewport(void); 程序例:

#include . j% |9 a0 H/ u! \' \& \. N. }$ h* J#include #include ! X: o/ o c7 n1 j0 y" \2 Y$ `#include

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

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int main(void) { 0 [- N% q8 c Y" ~) l0 W6 T# [/* request auto detection */ int gdriver = DETECT, gmode, errorcode; int ht;

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/* initialize graphics and local variables */ * Y5 t/ q! T! `/ vinitgraph(&gdriver, &gmode, "");

/* read result of initialization */ ; D2 r2 l0 Z( G/ i( k: F! H. j4 Eerrorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { + D/ K Y3 _! l$ o2 Z. Nprintf("Graphics error: %s\n", grapherrormsg(errorcode)); " N9 `1 Y O( s/ Y. f6 _printf("Press any key to halt:"); getch(); 1 a& c7 {% s# K3 M. ^* ]exit(1); /* terminate with an error code */ ' F9 v$ D5 ]+ C3 o2 _; j2 w4 {}

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setcolor(getmaxcolor()); ( |5 Q7 F$ M: F% x& l+ sht = 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);

/* display some messages */ outtextxy(0, 0, "* <-- (0, 0) in smaller viewport"); outtextxy(0, 2*ht, "Press any key to clear viewport:");

/* wait for a key */ / i) a5 i6 B3 Q, r2 `getch();

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/* clear the viewport */ - c0 b; G. w1 D9 |+ sclearviewport();

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

/* clean up */ 0 L" P8 S% q1 C& S! ~+ N: Hgetch(); closegraph(); 8 {" ]$ i ^! n% n% ]! \9 Hreturn 0; % }2 U% ]- v! b- L} 5 T8 t+ Y$ o: P# f+ c

函数名: _close, close 7 q4 f, q) ~# W3 O功 能: 关闭文件句柄 用 法: int close(int handle); 程序例:

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#include + D$ M% E+ v# S' e2 }9 n- q#include 5 E( N2 k c# d+ a3 ~2 P2 k#include + F9 N8 n* S+ d" [1 r. ~- h#include

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

/* create a file containing 10 bytes */ handle = open("NEW.FIL", O_CREAT); : Z" v! s8 X9 n5 D5 x! l% Lif (handle > -1) 2 i) C* K5 u1 [- o5 S6 i{ & I9 b% y7 l! H0 n7 A$ \write(handle, buf, strlen(buf));

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/* close the file */ close(handle); } 9 E \2 ]" F4 f; T$ o# d4 ielse # d; C" {0 v. C1 ]{ , {8 m0 h# X6 x2 R1 Q* I+ Aprintf("Error opening file\n"); } 4 U0 y! e- b" @+ ?+ Nreturn 0; $ k* q4 D* x& p3 X. M} + `- b$ L# A6 [0 H) I / F! m8 Q" y0 n0 v* k

函数名: clock 功 能: 确定处理器时间 ) l% a+ }( g0 l, C# L用 法: clock_t clock(void); 程序例:

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#include 4 m3 `' }( j! q5 z: Z! F r#include #include

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int main(void) 6 D( K/ T4 D* m{ 2 I. O p8 r. X; @9 e7 c) Rclock_t start, end; : q6 o# x/ t) {! Y& C$ P) j3 Hstart = clock();

delay(2000);

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end = clock(); / G5 C- |4 p& n, t' u0 }( p2 ?1 Hprintf("The time was: %f\n", (end - start) / CLK_TCK);

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return 0; 8 K3 L0 M1 e* B% G6 l}

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函数名: closegraph 3 K% ]$ e, p$ n9 |" z" K功 能: 关闭图形系统 6 I' ^ n! _& t用 法: void far closegraph(void); - ~' w9 z1 a- p程序例:

#include }" {: R1 [9 t9 k6 Q; ?( n#include #include 1 L! x+ K. f) W% J#include

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int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; 3 Z& K1 p o. r0 P8 @int x, y;

/* initialize graphics mode */ ) o) B+ T( E2 linitgraph(&gdriver, &gmode, "");

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

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if (errorcode != grOk) /* an error 7 A3 @; P% g$ V4 D5 ~- r e1 Goccurred */ 7 ?" V2 n p0 e( K ^$ Q( C( I{ printf("Graphics error: %s\n", grapherrormsg(errorcode)); / \; j* J, S5 vprintf("Press any key to halt:"); , C8 o! J; Q# n( C* R# K; igetch(); exit(1); /* terminate with an error code */ }

x = getmaxx() / 2; ( v, \( S1 B t. ~' Ay = getmaxy() / 2;

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/* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); . `: t5 \2 H+ o3 d/ t: R- R7 souttextxy(x, y, "Press a key to close the graphics system:");

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

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/* closes down the graphics system */ ) q: Z& i2 \8 {$ K3 C: {closegraph();

printf("We're now back in text mode.\n"); printf("Press any key to halt:"); getch(); return 0; 1 J! b& N! A0 e6 N) W% R} d6 V- ]) |/ _ 2 H1 i2 Q# Y6 v0 n

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函数名: clreol 功 能: 在文本窗口中清除字符到行末 用 法: void clreol(void); + G1 [* M( `2 e5 C3 ^) X3 D( z, o程序例:

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#include

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int main(void)

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{ 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"); 7 }1 j' V& D$ I1 mcprintf("current text window, without moving the cursor.\r\n"); cprintf("Press any key to continue . . ."); gotoxy(14, 4); getch();

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clreol(); 0 ]& J/ X7 k, f& I" ]getch();

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return 0; * w1 t& ?; H5 p# A" L2 H" Y} ' J( n. H8 S: D2 I e1 A

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函数名: clrscr 功 能: 清除文本模式窗口 + ~' Z# G% l( b/ | _用 法: void clrscr(void); , f( P7 F: \# |) A Q* G/ C程序例:

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#include

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int main(void) $ v: g& C' c# n. U$ q{ % ?" L8 I6 n4 [7 `- A* R1 hint i;

clrscr(); # w0 m) N1 N' q) g8 c8 V; n/ Lfor (i = 0; i < 20; i++) 7 P6 {* k" s2 H( z+ u. scprintf("%d\r\n", i); cprintf("\r\nPress any key to clear screen"); getch();

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

return 0; } ) L0 \2 A, J3 h# _2 W0 D; @ 4 ~& y5 {' b: Z8 Q5 j$ i

函数名: coreleft 8 O& m, g2 e9 E7 R. T o3 s功 能: 返回未使用内存的大小 用 法: unsigned coreleft(void); 8 J% r2 E* t* W( `程序例:

#include #include

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int main(void) { printf("The difference between the highest allocated block and\n"); printf("the top of the heap is: %lu bytes\n", (unsigned long) coreleft());

return 0; 0 C% ]0 q. V- T; Q, q}

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函数名: cos # Z/ {8 J" y5 K# b/ R; t功 能: 余弦函数 用 法: double cos(double x); 程序例:

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#include / H: @8 U. Z! i4 R; B" S R#include

int main(void) { double result; double x = 0.5;

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result = cos(x); & F2 b* Q+ w8 \3 J+ x- oprintf("The cosine of %lf is %lf\n", x, result); `+ s! f9 G. ?return 0; } / e- d9 p4 O$ u7 | , w5 _+ @! t: [) O# [" ~

函数名: cosh 功 能: 双曲余弦函数 0 F: g; v5 n. A) ^% h" \用 法: dluble cosh(double x); 3 H( X) B: O x5 x程序例:

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#include 4 w( {0 m; l: Q/ S+ F; j8 o#include

int main(void) t. R/ c5 a) I; D4 n! l* b& f( H8 }# U{ 2 F3 @) K" j8 d$ Qdouble result; double x = 0.5;

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result = cosh(x); printf("The hyperboic cosine of %lf is %lf\n", x, result); return 0; 2 A) K' X8 R$ W, N, b, ~# [} ! `. {/ Y$ R- C& S: Z" a* v $ i& Z* Y: F8 Q- T6 }

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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); 0 m8 `9 ?- d/ e0 E程序例:

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#include 5 V; F' F4 t" j* P k#include

#define USA 0

int main(void) * r/ K# @, L2 U& E7 [{ 9 v5 z4 P& C; j C8 @struct 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; 5 c5 w0 y$ l4 U' ~6 a} + a& U: Y) Q! M, F# R: K

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函数名: cprintf 功 能: 送格式化输出至屏幕 : I0 ?- z8 P& N: j k% L- q用 法: int cprintf(const char *format[, argument, ...]); 程序例:

#include

int main(void) . i# ]9 G7 J" a6 }{ ! P' ^0 i+ c9 T/* clear the screen */ clrscr();

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/* create a text window */ ' K) b# i6 A9 fwindow(10, 10, 80, 25);

/* output some text in the window */ 9 U! c! h8 w9 ^9 u. f; R0 acprintf("Hello world\r\n");

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/* wait for a key */ & R3 j( M2 b: @. o+ z& F8 tgetch(); 2 p0 E" Z/ ^: T, M2 s, | V0 ~return 0; 8 W8 @# i0 w5 L* H3 D# Y$ `} # e! _1 U& X& x2 h, g7 c ! ^; \% E! n9 o& C" m5 D C H

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函数名: cputs , E: b5 I% `" O功 能: 写字符到屏幕 , ?+ n( g5 W( n7 i用 法: void cputs(const char *string); 程序例:

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#include

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int main(void) { /* clear the screen */ & s, q0 ^/ B7 c. cclrscr();

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

/* output some text in the window */ ; t9 R5 N! ?/ Q3 wcputs("This is within the window\r\n");

/* wait for a key */ 4 ~+ d/ }: v1 z' p# u4 ]& L9 bgetch(); return 0; 3 P- k. v! q' r$ h} + ]6 B! t* O3 u' D. W

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); 程序例:

#include H) Z1 i" K- r& z4 c#include #include #include

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int main(void) { 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 */ ( i6 v$ M, q6 }6 vhandle = creat("DUMMY.FIL", S_IREAD | S_IWRITE);

/* write 10 bytes to the file */ * C" ]: K% U! J& J2 V4 o: W0 [. R% Dwrite(handle, buf, strlen(buf));

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/* close the file */ - w+ r% H/ g6 c( Z4 jclose(handle); 9 x5 U4 h! i4 z' Wreturn 0; } 0 e% o" p9 x5 \

函数名: creatnew v$ O( p. J* ?# n0 v4 o' Q. n功 能: 创建一个新文件 用 法: int creatnew(const char *filename, int attrib); 4 D) e; A/ L8 r5 y( }: s/ E' E" i程序例:

#include #include #include #include #include

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int main(void) & {3 w3 e- m7 f8 J{ * A O/ W# d+ E; e9 e7 `) Lint handle; char buf[11] = "0123456789";

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

if (handle == -1) printf("DUMMY.FIL already exists.\n"); else 4 K! j5 r! e2 ^# ~; f* R/ E" {{ ' q. X' y9 c- W# `* }8 \. }printf("DUMMY.FIL successfully created.\n"); 8 h. P9 E. z6 Kwrite(handle, buf, strlen(buf)); close(handle); } , k2 K' @- l" u1 B4 z3 |return 0; } , V3 G6 \+ o2 n7 ^5 \# a

函数名: creattemp 1 D3 P' @5 H+ Q1 U: N1 |$ @. m+ p功 能: 创建一个新文件或重写一个已存在的文件 6 U: \: o- ]) A用 法: int creattemp(const char *filename, int attrib); 程序例:

#include #include 6 g7 T5 g2 r% v#include

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int main(void) { int handle; char pathname[128];

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strcpy(pathname, "\\");

/* create a unique file in the root directory */ & g! B8 Q& }1 O6 F# yhandle = creattemp(pathname, 0);

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printf("%s was the unique file created.\n", pathname); & d' M4 V9 }% D% R& Z; z# M Oclose(handle); 6 m1 D* z7 Y2 U2 g0 {3 E: f3 Sreturn 0; $ X7 E' J9 s8 a0 a" j; I( f} 2 A2 t* O" [; {& K! y# \ , ~$ Z4 m8 F0 c7 j9 l8 @- h

函数名: cscanf 1 ], T. s2 V/ Q* j+ s8 D功 能: 从控制台执行格式化输入 ! Q6 _& W! @/ I+ o用 法: int cscanf(char *format[,argument, ...]); ( |% n% g# w# ~: Y1 Q& A程序例:

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#include

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int main(void) ' L# @. n' J) F. Y: [{ 1 f: E3 T1 Q# C) \$ Tchar string[80];

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/* clear the screen */ , u; @5 _$ o! `8 i0 c2 }clrscr();

/* Prompt the user for input */ 7 J0 N( f" R$ ?/ P: S8 e- F. i2 ]cprintf("Enter a string with no spaces:");

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

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/* display what was read */ cprintf("\r\nThe string entered is: %s", string); return 0; }

函数名: ctime * I: R7 s0 T5 F功 能: 把日期和时间转换为字符串 , R/ n4 Z# e% E2 K9 \: [9 f% m用 法: char *ctime(const time_t *time); 程序例:

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#include : U) V7 f' k$ C; h#include

int main(void) 5 k1 X% f" { \$ m{ time_t t;

time(&t); printf("Today's date and time: %s\n", ctime(&t)); ' j7 l0 j N8 f9 Areturn 0; } : K0 k( X3 g$ x8 I3 R: t ; o5 ?' v" U9 [9 U' W ' }% O* G9 Y& A; w

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 . o- x# r4 U% e#include

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#define ABORT 0

int c_break(void) { printf("Control-Break pressed. Program aborting ...\n"); ' L' r" ?2 R4 \5 e7 {1 V( w" Yreturn (ABORT); }

int main(void) 9 l/ N% ?9 B% H{ ctrlbrk(c_break); 4 a: T x6 p/ P4 v2 `for(;;) { printf("Looping... Press to quit:\n"); ! G _5 P' W# S7 K} return 0; * L. `2 X% R% R. N}

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