函数大全(c开头)

韩冰

函数大全(c开头)

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函数名: cabs 6 J& ^7 O0 L9 U功 能: 计算复数的绝对值 6 c, k: A7 F P4 W+ V. z用 法: double cabs(struct complex z); - w8 v6 s$ ]4 m程序例:

#include . [6 p* [. x3 w9 W% O+ `#include

int main(void) ; ^+ f e4 m/ n2 \; ~- J$ Z{ struct complex z; double val;

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z.x = 2.0; / e1 A8 W, e5 g! K$ W- f& ez.y = 1.0; 3 d7 h. W- b% u3 oval = cabs(z);

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printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); return 0; 7 `0 k% G8 Q: n% x4 { b0 L} 8 h7 j6 S, r8 I% o

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函数名: calloc 功 能: 分配主存储器 用 法: void *calloc(size_t nelem, size_t elsize); 程序例:

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#include #include

int main(void) { - s8 t* p+ t8 d( Bchar *str = NULL;

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/* allocate memory for string */ - G8 P3 M+ `7 G4 H4 }4 ostr = calloc(10, sizeof(char));

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/* copy "Hello" into string */ strcpy(str, "Hello");

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

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/* free memory */ . M' `- `/ K; b& ^6 qfree(str);

return 0; } ( P0 C1 M9 Z3 i/ `; H

函数名: ceil % J" q8 T3 e1 _+ \功 能: 向上舍入 用 法: double ceil(double x); " j |7 p5 f7 a1 A: A+ s. a" o% V( r程序例:

#include #include

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int main(void) : E# C3 @! l8 s2 x- \8 X, x% Q) S{ double number = 123.54; double down, up;

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

printf("original number %5.2lf\n", number); printf("number rounded down %5.2lf\n", down); printf("number rounded up %5.2lf\n", up);

return 0; } , u* `* n( A2 {2 V& f5 @" P" p

函数名: cgets + s# d- m6 d/ F! G8 _- U. n功 能: 从控制台读字符串 用 法: char *cgets(char *str); 程序例:

#include #include

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int main(void) 8 e6 _3 h. ?; A4 O{ char buffer[83]; char *p;

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/* There's space for 80 characters plus the NULL terminator */ 2 W8 _" Z4 w# Bbuffer[0] = 81;

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printf("Input some chars:"); + S, f& ~7 r, T4 K L8 l; lp = cgets(buffer); 1 b3 x b# \/ Rprintf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); I% ]/ Z, A. hprintf("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;

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printf("Input some chars:"); p = cgets(buffer); - c* Y" l W" u1 [printf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); 4 @3 A* H& c% r/ t" N8 e1 t* {, ?printf("The returned pointer is %p, buffer[0] is at %p\n", p, &buffer); return 0; & F: e* F7 h, _( M9 }$ _8 o+ u5 H: |9 Y} ! W# Y( Z9 {. [ w) e3 _

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函数名: chdir 功 能: 改变工作目录 # I0 b3 _" Y; R/ h用 法: int chdir(const char *path); 7 c( C( c6 h) }( ?; |: {程序例:

#include . j# B7 N9 F% k1 q#include 0 A! W6 c8 i U! O6 ]#include

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char old_dir[MAXDIR]; / `: J1 ^# {6 e! C6 B! u8 ]char new_dir[MAXDIR];

int main(void) 4 [& x- t3 H# l/ m3 B! j" I" U2 R7 v{ + }+ F( P! c3 W/ d1 Vif (getcurdir(0, old_dir)) , D. a- ^* p7 a{ perror("getcurdir()"); exit(1); , p/ H" T9 h! ?& M} 6 Y( u/ ^$ ~! [( r4 V& S- Hprintf("Current directory is: \\%s\n", old_dir);

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if (chdir("\\")) 4 K- V9 p' E6 R$ n3 v9 m{ perror("chdir()"); exit(1); 2 U* f* f- V" C. }}

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if (getcurdir(0, new_dir)) ; k. I/ A" X# z, ~2 ^! Z b{ perror("getcurdir()"); " W6 |9 V- L" O( \& t* zexit(1); # [6 m$ ]+ o4 F3 g6 j9 U1 J} 7 Y. U3 {2 H" y* t, vprintf("Current directory is now: \\%s\n", new_dir);

printf("\nChanging back to orignal directory: \\%s\n", old_dir); 0 w% ?+ f0 l2 N7 B# Kif (chdir(old_dir)) 4 y* f/ E/ ]) U( c, ~{ perror("chdir()"); / H3 q. F& N6 }3 Z" b8 @0 \exit(1); 5 a% }: D$ Z6 ?8 c' L/ _}

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return 0; } & t. r9 B% F$ t4 Y

函数名: _chmod, chmod * y* u- N" a5 J功 能: 改变文件的访问方式 用 法: int chmod(const char *filename, int permiss); & L! R- c& A- k' f6 K3 A" v9 W3 F7 p程序例:

#include 3 K6 X% f7 V# h5 U: L#include 4 T5 O( U( [5 b% _0 Z6 `% h#include

void make_read_only(char *filename);

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int main(void) { $ V2 Y% D% L3 g+ cmake_read_only("NOTEXIST.FIL"); make_read_only("MYFILE.FIL"); return 0; }

void make_read_only(char *filename) 7 K* S. G+ g4 N+ `6 F- W% {{ int stat;

stat = chmod(filename, S_IREAD); if (stat) printf("Couldn't make %s read-only\n", filename); / P5 \3 o$ Z6 x7 u g, n+ X: lelse printf("Made %s read-only\n", filename); } * ^$ d& O% n$ z5 B + j1 W7 Y' ?5 {: s7 H' ^

函数名: chsize 功 能: 改变文件大小 + L* v5 j; y( `8 y" i用 法: int chsize(int handle, long size); ) T1 J* l& @7 |, V/ ~* R9 s0 q程序例:

#include #include #include

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

/* create text file containing 10 bytes */ 0 z; g9 H X( _, q; Ahandle = open("DUMMY.FIL", O_CREAT); ; b/ i+ @: R, B' y& v5 w/ D5 I5 Wwrite(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; } & \+ L3 G6 K1 {: u. _! I

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函数名: circle , K: x" h' R7 M- s: V% i5 L5 h# g功 能: 在给定半径以(x, y)为圆心画圆 3 @* C1 V6 j1 P! [7 g3 r用 法: void far circle(int x, int y, int radius); 程序例:

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#include + m3 Q7 w( ?+ K6 X* k" b#include ; j1 k& O3 ?/ U5 a6 `0 J) g#include #include

int main(void) { ) a1 W N1 E: r. \! ]& F! o4 k. b& {/* request auto detection */ 9 u; L* B+ y& X5 Cint gdriver = DETECT, gmode, errorcode; int midx, midy; int radius = 100;

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

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/* read result of initialization */ J: W" L. o/ t3 G+ |$ J: w8 i! terrorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ 6 C' K! Q6 P8 V7 E4 {{ printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); 0 m; K0 r( \. p, D, x9 D Hexit(1); /* terminate with an error code */ }

midx = getmaxx() / 2; % t0 n% r2 Z s0 Dmidy = getmaxy() / 2; setcolor(getmaxcolor());

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/* draw the circle */ 0 a2 G6 @0 X3 Q0 \& p( ?circle(midx, midy, radius);

/* clean up */ getch(); closegraph(); return 0; 4 G( H1 X5 A4 A} . O# x3 N9 E3 [" y* d2 A ! d, }) d, W d6 z4 y" b! [. k

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函数名: cleardevice 功 能: 清除图形屏幕 6 J! t0 W0 z8 O4 A用 法: void far cleardevice(void); 程序例:

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#include #include + t0 i4 A& F! L" q$ D. W( ]! F; J#include #include

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int main(void) % h% Z2 N# w/ h6 ?+ r" p% g! h{ /* request auto detection */ . ^6 o% w/ w, r5 l$ w e! Rint gdriver = DETECT, gmode, errorcode; int midx, midy;

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

/* read result of initialization */ 5 k B$ p/ [* C. }* G. \errorcode = graphresult(); 6 a" L9 ^8 e: P, J+ v' u. dif (errorcode != grOk) /* an error occurred */ { $ m1 ] [% _( Dprintf("Graphics error: %s\n", grapherrormsg(errorcode)); 1 u# _9 m0 b7 V: G6 Vprintf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ 4 I$ d! T$ D$ c& j}

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

/* for centering screen messages */ A6 L' D4 h" {. H2 N: Gsettextjustify(CENTER_TEXT, CENTER_TEXT);

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/* output a message to the screen */ ; c% [: L7 l. Couttextxy(midx, midy, "press any key to clear the screen:");

/* wait for a key */ / ?3 {& R0 c8 |7 d4 Y! rgetch();

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/* clear the screen */ : g& A9 A3 P; P/ n7 Hcleardevice();

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

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/* clean up */ / d9 Y. c5 O/ `% o( Bgetch(); closegraph(); return 0; 2 e. g& o; O/ S}

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函数名: clearerr 功 能: 复位错误标志 3 f2 l, \9 R: L$ _: m R& E) s& \9 z用 法:void clearerr(FILE *stream); 8 u" A' x, n' V- |$ T" ~( p: z程序例:

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#include

int main(void) { & v2 j* g4 ^6 d: U# P9 c* p( EFILE *fp; char ch;

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

/* force an error condition by attempting to read */ 3 T6 ~+ S4 g; o- p+ b9 dch = fgetc(fp); 5 t7 Q5 v7 c, T, uprintf("%c\n",ch);

if (ferror(fp)) { p' v, n0 f& S# A+ }2 S/* display an error message */ ! C8 c' Z5 T9 [# l5 ?printf("Error reading from DUMMY.FIL\n");

/* reset the error and EOF indicators */ / D5 g: G$ t8 a ^0 Cclearerr(fp); z. n/ z+ V0 h0 i}

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fclose(fp); return 0; } : q. |0 o, s# x! N! ?" m+ i

函数名: clearviewport 功 能: 清除图形视区 用 法: void far clearviewport(void); - F: u2 M5 A' r4 K( H程序例:

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#include #include #include #include

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

int main(void) { 3 f% |% y+ P+ C3 _% s* W! i/* request auto detection */ 6 L; x" N& O# e: C5 F. Qint gdriver = DETECT, gmode, errorcode; ' |7 L& L! z+ W: F; N+ K6 M7 I- xint ht;

/* initialize graphics and local variables */ 0 I( j- [( F7 b# t S. yinitgraph(&gdriver, &gmode, "");

/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { 1 r2 f* z- r& i9 mprintf("Graphics error: %s\n", grapherrormsg(errorcode)); 8 Y* f* H) B2 E8 R0 vprintf("Press any key to halt:"); getch(); g9 L2 H3 P3 d3 }; Oexit(1); /* terminate with an error code */ 6 a7 n9 }+ N' a k, t* H; b}

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setcolor(getmaxcolor()); ( H% p' t2 K9 n5 X( O1 v! X2 n/ v$ tht = textheight("W");

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

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/* create a smaller viewport */ , k- M' E& I/ d9 E- q4 B3 Ssetviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);

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/* display some messages */ outtextxy(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 */ getch();

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/* clear the viewport */ 9 g- Y% Q: L7 q& z; y6 b4 pclearviewport();

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

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/* clean up */ ) V6 z6 H( [" m0 S5 `2 K0 Tgetch(); closegraph(); return 0; 1 T/ y" L& b6 K5 s} 9 R7 y0 i4 w' Z B5 E 9 K Y6 ^$ v" G. ` P& D, @# D / A. a8 Q+ U9 ^3 d- P6 [- u

函数名: _close, close 功 能: 关闭文件句柄 用 法: int close(int handle); 程序例:

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#include #include 5 ~+ P& A& h' @6 z; L7 W5 N#include #include

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

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/* create a file containing 10 bytes */ & j+ D7 J! c2 m' M/ s( ?) _handle = open("NEW.FIL", O_CREAT); if (handle > -1) { 9 ?& ?4 o. c/ }5 n8 d( xwrite(handle, buf, strlen(buf));

/* close the file */ close(handle); # N j# F3 N( i7 w} / {# }* Y/ J8 v1 Z4 |) u9 h" Felse 6 T. c _: Q2 ^0 }9 B! [6 q; r) c6 c{ printf("Error opening file\n"); 0 a4 j" m$ i6 {$ v8 B% u* G! R} return 0; 5 q U# D6 r* i; r0 `! Y8 c3 G} 6 c" j$ s, V( G ; Z+ c" Q! g9 x8 a

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函数名: clock 7 c( z7 V% X G6 L9 @功 能: 确定处理器时间 用 法: clock_t clock(void); 8 {! U& Q' N' F& H! \ D$ c! t: o( f程序例:

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#include : O+ Q$ T* B# a#include #include

int main(void) + R: @+ |3 ?: |* g7 N{ clock_t start, end; N( P) s& n/ T: ^ l/ bstart = clock();

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delay(2000);

end = clock(); printf("The time was: %f\n", (end - start) / CLK_TCK);

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return 0; . I2 O0 ]7 e n/ J} ! B, h+ i1 _ o. _+ e+ B) {

函数名: closegraph 功 能: 关闭图形系统 用 法: void far closegraph(void); 4 C- W. Q/ H$ x程序例:

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#include % }% D% [0 x1 v6 k6 b C/ h8 o' C- Z#include #include / S& @7 n% ]. k#include

int main(void) { - l) O/ D5 n, G) K2 I) V9 k/* request auto detection */ 0 W$ p: M$ j, S p7 Gint gdriver = DETECT, gmode, errorcode; int x, y;

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

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/* read result of initialization */ ) [, o0 e. x' |3 G, R' y- serrorcode = graphresult();

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if (errorcode != grOk) /* an error % J9 }3 Q" }0 k' Z! I% qoccurred */ { 8 O) x8 ^& ^( B5 x; ?8 Gprintf("Graphics error: %s\n", grapherrormsg(errorcode)); 7 A% J6 m$ i8 w' mprintf("Press any key to halt:"); $ v5 p& E. D7 t& ngetch(); exit(1); /* terminate with an error code */ }

x = getmaxx() / 2; 7 q: Q* v0 }; ry = getmaxy() / 2;

/* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "Press a key to close the graphics system:");

/* wait for a key */ + ]6 ^8 W# p5 n9 `+ U8 _getch();

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

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printf("We're now back in text mode.\n"); printf("Press any key to halt:"); getch(); % C& D3 O* N E# dreturn 0; . w# F% u) M5 k$ m} 6 k; T: t6 ]& O' \

函数名: clreol 功 能: 在文本窗口中清除字符到行末 ( `* F8 F2 }. k- n- i7 L7 I, I用 法: void clreol(void); 程序例:

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#include

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int main(void)

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{ clrscr(); & A; H0 ^, U" b1 G0 B! T1 b( kcprintf("The function CLREOL clears all characters from the\r\n"); cprintf("cursor position to the end of the line within the\r\n"); cprintf("current text window, without moving the cursor.\r\n"); , r* b" b+ {8 C" ucprintf("Press any key to continue . . ."); $ H4 g$ Z; _7 `& bgotoxy(14, 4); # Z! u" R o% o M$ M8 K2 e/ ngetch();

clreol(); getch();

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return 0; " `' k4 c8 C! r1 {7 O8 m9 i} 6 J1 [5 f) r# J2 e ) ?3 N% l; O2 p5 C

函数名: clrscr 功 能: 清除文本模式窗口 $ q: P, y O. p用 法: void clrscr(void); 程序例:

#include

int main(void) { int i;

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clrscr(); % A$ w. C& j* M2 bfor (i = 0; i < 20; i++) , q t* @2 V8 w3 S+ q- \cprintf("%d\r\n", i); - B; F* a7 S$ h0 m* D6 V2 Wcprintf("\r\nPress any key to clear screen"); - D: r9 G; T, A1 J6 J! d* Y) vgetch();

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clrscr(); 0 B9 D8 R" I9 D0 H, R! Hcprintf("The screen has been cleared!"); 0 {" m% ]) J6 K( X8 K1 ]9 x7 r& qgetch();

return 0; ) |" Q; J! Z. H( b V}

函数名: coreleft 8 O3 h$ M+ H1 V8 Y% h- i; [4 \$ L功 能: 返回未使用内存的大小 用 法: unsigned coreleft(void); 程序例:

#include / p/ C) I; J6 n* k$ V: j9 F2 m3 j#include

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int main(void) $ U4 H; E# K! n0 e# z6 F{ . O7 V9 ~ y) m# gprintf("The difference between the highest allocated block and\n"); printf("the top of the heap is: %lu bytes\n", (unsigned long) coreleft());

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return 0; C6 ^- l2 N8 j0 M} x4 B3 [# Q' P9 S

函数名: cos 7 S7 {1 b! K8 C; g/ {, |( I4 i8 b功 能: 余弦函数 9 y8 P7 `2 r7 s& I6 l1 S: I9 r+ v用 法: double cos(double x); 程序例:

#include #include

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int main(void) ! a }6 S- }3 M; `1 \, W1 z{ 1 ^1 W% [9 |; S8 } P" R' l4 _double result; % o& A$ d7 D! y& qdouble x = 0.5;

result = cos(x); printf("The cosine of %lf is %lf\n", x, result); ; X( u) k: Z" {# D: i% p9 V7 {return 0; }

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函数名: cosh 功 能: 双曲余弦函数 . ]" K. Q* W4 i% A. g- q, E用 法: dluble cosh(double x); ' L2 b3 [8 l8 h. Y5 k程序例:

#include % w3 d4 N0 u2 q1 _#include

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

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result = cosh(x); 3 k( R3 n. h0 T1 aprintf("The hyperboic cosine of %lf is %lf\n", x, result); 8 [, F J$ o, hreturn 0; 6 |- ^7 O1 [7 g) m" Y) w} 8 W9 i+ R4 Y( c$ O0 Z% k

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函数名: country 功 能: 返回与国家有关的信息 & L( H0 I; d: B7 b* P用 法: struct COUNTRY *country(int countrycode, struct country *country); & w: g# D% `+ g' } E. G+ n6 S程序例:

#include #include

#define USA 0

int main(void) " }2 G5 s% L$ V9 D% D7 F# \1 t8 F+ D{ struct COUNTRY country_info;

country(USA, &country_info); : I* H! c. X. E$ yprintf("The currency symbol for the USA is: %s\n", country_info.co_curr); - f+ Q! u1 m/ kreturn 0; } 3 ~) S/ L9 r9 e( x; y: J$ f % J( h- z5 b* T( e

函数名: cprintf 9 _0 f: S: t8 h8 |功 能: 送格式化输出至屏幕 + s J, J; w- j# ~3 u用 法: int cprintf(const char *format[, argument, ...]); 程序例:

#include

int main(void) ! m* h R8 g0 V. R{ /* clear the screen */ * D9 D' S. w4 u' L6 fclrscr();

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/* create a text window */ 1 p* h) ]! B0 g% cwindow(10, 10, 80, 25);

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

/* wait for a key */ 1 f" u, j8 t7 S% b c) Z! Ugetch(); ! Y2 F3 s' o% U5 Ereturn 0; / P" ?* r6 t& y7 J7 x} + ?: p, G$ b6 R) R7 A3 {+ J+ k , Y t4 C. {2 o$ U u X

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函数名: cputs 功 能: 写字符到屏幕 8 w" H3 _& T4 ]. p2 h5 ]0 y2 B用 法: void cputs(const char *string); 程序例:

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#include

int main(void) & H& \+ P$ A5 |% T; I: O6 t! y{ /* clear the screen */ # Q; C7 |. I. R8 a6 e) J4 |6 ~$ v% ?clrscr();

/* create a text window */ window(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(); return 0; ! J/ O7 J2 b8 f6 _/ U5 \% {} & k: r& o2 x4 ]% q. |% t

函数名: _creat creat 2 n- R* N1 P) [) G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); / y. V, T. u8 ^1 y; D* D* A程序例:

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#include . S7 I7 w# h8 a#include 0 @2 T$ u3 m7 G3 k8 P) Z5 C, e3 p#include #include

int main(void) { int handle; ; t* y, ~- I7 M* ychar 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 */ 3 G$ _' I* t1 _# l7 ghandle = creat("DUMMY.FIL", S_IREAD | S_IWRITE);

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

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/* close the file */ . J- u2 S. p" K7 V! S# zclose(handle); ) Z4 c8 ]6 v6 j7 x7 Dreturn 0; }

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函数名: creatnew 8 y$ E# q0 A# w9 c功 能: 创建一个新文件 5 x4 U- f1 C' N" Y( ?用 法: int creatnew(const char *filename, int attrib); 1 ^9 W! |7 X" W程序例:

#include #include #include 2 K0 l! b" R1 S. m" H" n* T#include % B: V/ _$ g- o2 F, V! J0 K#include

int main(void) ) q" \, a9 p" G5 H{ 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);

if (handle == -1) % \! X8 ]/ Q) P H( O; Mprintf("DUMMY.FIL already exists.\n"); else { printf("DUMMY.FIL successfully created.\n"); write(handle, buf, strlen(buf)); 4 }0 o: @9 V" p9 Uclose(handle); 1 W: \* K- W, R- D1 s} return 0; & I! O: b$ B. J! o} " [6 G- j3 @/ U% L" U. d : [. `3 P/ m7 u& i* @" v! _! S+ [( l1 V

函数名: creattemp + E; R2 _9 w5 u6 u2 I {功 能: 创建一个新文件或重写一个已存在的文件 / K2 r0 ?. z$ v" k2 `用 法: int creattemp(const char *filename, int attrib); 程序例:

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#include #include 8 _ R4 M n2 w/ A9 ~; ~#include

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int main(void) { int handle; ( D; P7 O+ I& J8 D( k; echar pathname[128];

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strcpy(pathname, "\\");

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

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printf("%s was the unique file created.\n", pathname); : ` ~3 B3 u5 L0 i7 @2 Rclose(handle); - R1 L( i+ k3 ^. ?- p/ W/ d6 B* Areturn 0; . }* T- _! \9 X- O}

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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, ...]); 程序例:

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#include

int main(void) : i8 B6 t5 D! E* n9 n# q- l{ char string[80];

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/* clear the screen */ clrscr();

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

/* read the input */ 1 H, t" a" j. p. acscanf("%s", string);

/* display what was read */ cprintf("\r\nThe string entered is: %s", string); . {/ D; _6 F2 _* z, \return 0; } T, e) K, R8 X3 W

函数名: ctime ' {4 g9 J# e' z功 能: 把日期和时间转换为字符串 + r" W Z2 t: v) F用 法: char *ctime(const time_t *time); 程序例:

#include #include

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int main(void) { time_t t;

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time(&t); printf("Today's date and time: %s\n", ctime(&t)); $ G; M5 k. O& Z+ w3 s9 H, zreturn 0; ' K, B0 b$ k7 h% J* V9 M} 4 P2 W. K Y: f) b

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函数名: ctrlbrk 功 能: 设置Ctrl-Break处理程序 & t% d4 y% M: m5 W% N5 e用 法: void ctrlbrk(*fptr)(void); : [ k: |2 |5 n5 e [7 Q6 |程序例:

#include 6 e0 G1 I4 d; |3 N#include

#define ABORT 0

int c_break(void) { printf("Control-Break pressed. Program aborting ...\n"); 8 T0 F( n; B/ K* S% p! ?9 ~return (ABORT); ' e( ^" S+ y9 {# m+ I# ?) y}

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int main(void) ! h: d5 K5 |; L- s{ + W, m5 l+ @+ F' U- Z( Dctrlbrk(c_break); ; X8 \+ p) _4 u/ U6 }2 {for(;;) 6 R& M. G& `! H( ?7 f; [) v( t{ # H& z4 U6 }1 [+ H. _& t3 \/ nprintf("Looping... Press to quit:\n"); . M! @- c2 k' I* i' }' S} 2 w/ \1 u. Z( ^( t9 ]8 creturn 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