函数大全(c开头)

韩冰

函数大全(c开头)

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函数名: cabs & H* y- g# X7 y A' M0 [功 能: 计算复数的绝对值 8 a+ W- p9 ]8 h1 x% c+ \用 法: double cabs(struct complex z); & V1 [' {3 o- ^9 c' ?9 v程序例:

#include #include

int main(void) " y1 p; c) S; M8 g' Q% ]{ ( ~1 I! q+ m5 r3 y: d' j2 G$ E" ostruct complex z; 6 ?- l, T5 z. ?2 bdouble val;

z.x = 2.0; z.y = 1.0; % M+ @) w- u4 oval = cabs(z);

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printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); return 0; } : @3 e) @. S; @1 ~7 ]# f7 R ' G" A: z2 n. ?& Q# [

函数名: calloc ( T" J% w m0 P( Q功 能: 分配主存储器 用 法: void *calloc(size_t nelem, size_t elsize); 7 f$ U6 }* G( ?, t- H# w程序例:

#include % ]7 n8 }( A/ |0 W2 F( }' S4 D4 h#include

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int main(void) $ H( o# d! B& e{ char *str = NULL;

/* allocate memory for string */ 6 R7 x7 x9 P8 |5 m! n* J& Ostr = calloc(10, sizeof(char));

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/* copy "Hello" into string */ " F Y/ U- K" H& b r, Nstrcpy(str, "Hello");

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/* display string */ / s( B, N1 M6 R7 f/ Q: `printf("String is %s\n", str);

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/* free memory */ ( m$ ~4 U6 {% R: Mfree(str);

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return 0; } * B: U/ X% ~3 D8 c' M' n

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函数名: ceil 功 能: 向上舍入 % w8 ~6 c& C1 @用 法: double ceil(double x); 程序例:

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#include ' E5 {0 ^4 U8 t#include

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int main(void) % g) O' n' }6 X" G* Z, ^3 H{ * F' H! g( i7 zdouble number = 123.54; ) `% D( m( \2 d5 s! Q4 R! ]double down, up;

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down = floor(number); 1 z0 I; X" u6 r8 yup = ceil(number);

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printf("original number %5.2lf\n", number); 4 y3 F, `& S. B1 c Dprintf("number rounded down %5.2lf\n", down); printf("number rounded up %5.2lf\n", up);

return 0; 6 I" `) o' {# b. C- U( b} / L, ?* e8 e" [ $ b* m& S8 n+ F

函数名: cgets * Z9 D8 n1 C: l9 q! N0 K功 能: 从控制台读字符串 5 q) H* w8 o4 u1 w9 \, z, d用 法: char *cgets(char *str); 程序例:

#include #include

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int main(void) { K8 Q) Z8 ?, t2 h$ A/ [+ [, Xchar buffer[83]; . m( q$ {2 z& e2 a) A! W! |) Schar *p;

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/* There's space for 80 characters plus the NULL terminator */ % @' G3 `8 z7 y: }6 N; @8 t; Wbuffer[0] = 81;

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printf("Input some chars:"); 4 L8 p7 e4 q0 K9 V+ Fp = cgets(buffer); " S9 L9 `: f. b; K: G& _1 Xprintf("\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;

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printf("Input some chars:"); , | G+ q. `- Ep = cgets(buffer); printf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); - ]3 B; ^/ R; iprintf("The returned pointer is %p, buffer[0] is at %p\n", p, &buffer); return 0; } * \* ~: A6 ^' R$ `0 u. y

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函数名: chdir / l4 G* q U+ j6 A0 [0 n功 能: 改变工作目录 + ?- a0 v4 t" Z, U( J5 w用 法: int chdir(const char *path); 程序例:

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#include #include 2 ^$ M3 F5 F a) ~. v* ?) @) {: U#include

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char old_dir[MAXDIR]; ; n/ ^6 \& V7 ^3 X1 |2 z7 Ochar new_dir[MAXDIR];

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int main(void) / |, G x1 v. j9 A{ if (getcurdir(0, old_dir)) { perror("getcurdir()"); + `. @7 G8 n1 r, o; O+ d2 ^1 @1 [. mexit(1); } printf("Current directory is: \\%s\n", old_dir);

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if (chdir("\\")) { perror("chdir()"); * C( X; O* P" X5 l+ \exit(1); - o2 D2 }, B1 N}

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if (getcurdir(0, new_dir)) { 2 y! c7 B& H; F: D: ~) ~' Xperror("getcurdir()"); + A: q3 [& [ H2 |exit(1); $ M5 k+ k8 ?) w8 N$ t$ Y3 [} 8 M% ^& p+ d& y) N+ jprintf("Current directory is now: \\%s\n", new_dir);

printf("\nChanging back to orignal directory: \\%s\n", old_dir); if (chdir(old_dir)) 7 \1 Z1 |* ^7 i/ d" t: z9 {{ perror("chdir()"); 3 H1 M* B' ^! s# L @" |. c# C) ]exit(1); }

return 0; 0 ~/ N& U9 d1 Z8 C2 y+ Y& r} 4 I, u2 Q" @% f1 c8 V6 M9 ] 6 W( k% d, b% U$ u, j

函数名: _chmod, chmod - D) f, P- L7 g7 @7 L9 o3 g; @功 能: 改变文件的访问方式 用 法: int chmod(const char *filename, int permiss); 程序例:

#include + U. g! k1 V* r _#include #include

void make_read_only(char *filename);

int main(void) { 2 M+ u. X; Z, K- amake_read_only("NOTEXIST.FIL"); - ^' x+ l) e/ a, U, w, r! ^# {make_read_only("MYFILE.FIL"); return 0; ; n1 B- H- s! E' D0 E& G: {}

void make_read_only(char *filename) / n$ F4 i* _# d- E" E{ . e' l# O8 m3 r5 g; z. j3 @ _2 aint stat;

stat = chmod(filename, S_IREAD); 2 ~- |: o2 D0 {if (stat) . o9 Q1 v& j. o3 hprintf("Couldn't make %s read-only\n", filename); " i: `2 s% j5 J; |1 N4 L4 Welse printf("Made %s read-only\n", filename); } & w; V+ H; ^% X. u* y. P

函数名: chsize ! z9 R( Z- J' f+ T$ Z+ r) x功 能: 改变文件大小 $ r# f$ L7 w: y! I2 s9 j4 w$ H用 法: int chsize(int handle, long size); ; f' V2 `- j9 n$ U* Y程序例:

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#include ' q- F7 t# Y/ {. \) H) B* q#include #include

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int main(void) ) d2 W% P+ n3 m: b- w{ ; Z# D9 W, Y, r2 o; aint handle; . M2 i5 @! w" E$ e, b: lchar buf[11] = "0123456789";

/* create text file containing 10 bytes */ 1 m8 \$ q3 H, I" Lhandle = open("DUMMY.FIL", O_CREAT); ( L. D) S' x) U) F. |' h1 Iwrite(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; ( K- t0 j5 Z% y1 S' z. I} . \, _; C4 ^5 }9 [, v5 h" |

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函数名: circle 7 R% f6 Y9 X/ r+ Q6 t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); $ U6 x; l) \. h" |$ Q0 n; w1 K9 ~程序例:

#include % t7 H" i8 l0 F/ K o#include #include #include

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int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; " e. e* m7 R( u0 E0 H/ q) Eint midx, midy; int radius = 100;

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/* initialize graphics and local variables */ 0 F; }, m$ b7 v7 ?; o7 E- \initgraph(&gdriver, &gmode, "");

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/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ ; n' u$ S" L4 e{ printf("Graphics error: %s\n", grapherrormsg(errorcode)); ( ]6 R9 t# S: A1 `7 ~printf("Press any key to halt:"); getch(); 3 z, u; H7 L% t3 m! m1 Jexit(1); /* terminate with an error code */ 5 r! z4 }1 E O. p}

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midx = getmaxx() / 2; , ^0 N# l2 R7 U2 L/ y3 tmidy = getmaxy() / 2; 8 a$ x0 {! N) B0 u0 D' ^setcolor(getmaxcolor());

/* draw the circle */ : s! F8 |8 _! qcircle(midx, midy, radius);

/* clean up */ # t4 t. _. s: t. @/ _* Z) lgetch(); closegraph(); # y$ ]9 z+ L Z' a. l- u8 {return 0; } " q) y g( O$ `, A# F; M/ A6 R8 Y1 { 3 B2 w3 d/ i9 }; w

函数名: cleardevice 功 能: 清除图形屏幕 9 l+ m ?0 ]0 \$ L$ T( m6 p' o用 法: void far cleardevice(void); , K( r6 |. w% E5 B/ t9 t: o5 z程序例:

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#include 0 R- j( P; Y$ ~9 O/ {. v#include #include #include

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int main(void) . j! j7 @; n p1 z{ /* request auto detection */ - K* p6 S1 s3 Dint gdriver = DETECT, gmode, errorcode; 4 x, i9 L8 x3 y. Jint midx, midy;

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/* initialize graphics and local variables */ % c/ r1 \3 R8 L1 G/ jinitgraph(&gdriver, &gmode, "");

/* read result of initialization */ 7 {5 ]# c: ^2 f4 derrorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ ) [! }/ g0 u- T' ?) r7 l8 P0 E: E1 D{ ( [# v+ a+ |3 h/ P' a( {printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ : z8 K. r, R M3 f1 Z# B}

midx = getmaxx() / 2; 4 E6 ~' u' u* T, u% amidy = getmaxy() / 2; ' M: S1 E: R% A \! l: d4 hsetcolor(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:");

/* wait for a key */ * A; `! w: b) G! x' E" G& Tgetch();

/* clear the screen */ , w( I( i! h# t. Rcleardevice();

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

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/* clean up */ getch(); 4 F; Z, {+ S) h9 _: Jclosegraph(); , ?: t2 h" z% A+ l0 H: Freturn 0; } $ h) J$ s5 b e9 h* m5 a

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函数名: clearerr 功 能: 复位错误标志 0 H* d( P" a! h用 法:void clearerr(FILE *stream); . I8 U( o7 K, ]程序例:

#include

int main(void) { FILE *fp; - H u9 G5 y8 m6 D/ nchar ch;

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

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/* force an error condition by attempting to read */ 3 X4 z* [! o, U! A0 K& l8 e/ cch = fgetc(fp); printf("%c\n",ch);

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if (ferror(fp)) { & G2 C6 s5 U/ B% F0 t _# r/* display an error message */ printf("Error reading from DUMMY.FIL\n");

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/* reset the error and EOF indicators */ clearerr(fp); }

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fclose(fp); return 0; 8 S+ ?4 o; m; H& M+ t} 8 ~5 o4 e0 {9 G+ \/ n( _ ' b9 M; V% F' J7 e9 w6 b

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函数名: clearviewport 功 能: 清除图形视区 用 法: void far clearviewport(void); & c7 {9 U5 x, }程序例:

#include #include #include 8 N: y& ]' [! |& l! k. |7 m#include

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

int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int ht;

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/* initialize graphics and local variables */ 4 j2 _0 u$ ^1 b. o" ^# dinitgraph(&gdriver, &gmode, "");

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/* read result of initialization */ + q7 O0 m* Y" n6 jerrorcode = graphresult(); ) L8 W* z( F- o6 l0 H/ e7 m5 Z$ Jif (errorcode != grOk) /* an error occurred */ { / t" O5 A, Y# {9 e$ tprintf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); ' V/ ^& d4 k% x/ O$ [: k$ ugetch(); # f. z! l! d5 B j# _4 O! F$ I( A+ nexit(1); /* terminate with an error code */ }

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setcolor(getmaxcolor()); ht = textheight("W");

/* message in default full-screen viewport */ ! P1 N- K2 O* b, Q* s" W+ X, uouttextxy(0, 0, "* <-- (0, 0) in default viewport");

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/* create a smaller viewport */ ; O/ s/ K% g- Q/ ]. Osetviewport(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 */ ) w; M! S P3 v: F3 e8 p- wgetch();

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/* clear the viewport */ 9 @* o/ \) u0 X* t- |clearviewport();

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

/* clean up */ 0 o" i; P, X3 J. b1 }getch(); 8 N; B4 l( p- W, v4 A7 Oclosegraph(); return 0; } / _3 O: T% Q. g4 v! {3 C & M# G$ d9 h! r: F" S: s' I7 p$ K7 r

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函数名: _close, close 9 j) y7 y9 q/ L: t8 F! y9 d功 能: 关闭文件句柄 ( j8 Y3 k( K) q. d用 法: int close(int handle); " b8 B8 b; @/ C' q. |1 N程序例:

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#include ) R; G( g: |1 }, g5 I3 h#include 6 p8 I5 H$ c9 i7 |3 ?#include #include

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main() ! f1 V; n; G& `7 P% E! D' Y/ I{ int handle; , B3 ~# y* q/ G: n% d2 O3 ychar buf[11] = "0123456789";

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/* create a file containing 10 bytes */ ) h+ w( Z, S) a# p1 ~2 Phandle = open("NEW.FIL", O_CREAT); if (handle > -1) { write(handle, buf, strlen(buf));

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/* close the file */ close(handle); 5 H4 a# I1 F' j U2 C* R8 j7 J} 1 A, _) ^( ]; D) z' m. G" }& V6 k) Ielse 3 ]% b. w; l6 E) e: i! X( l{ printf("Error opening file\n"); 1 p* i) I( F+ }" p7 d( i. I+ H} return 0; } 5 _. s: H4 k( j$ u6 [) X$ p% H* p: N; B

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函数名: clock 功 能: 确定处理器时间 ) ?/ s, C" H) N用 法: clock_t clock(void); , K5 ?6 D. t0 i" i程序例:

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#include 1 P6 q/ l* s; o$ X#include #include

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int main(void) . E- Q2 x. g7 g d$ {{ clock_t start, end; # c$ x4 J! N8 I+ b! Wstart = clock();

delay(2000);

end = clock(); 0 S; N- L+ u% N/ K0 r+ N6 Q+ dprintf("The time was: %f\n", (end - start) / CLK_TCK);

return 0; }

函数名: closegraph 功 能: 关闭图形系统 # O, V( Z7 [" s1 \: I用 法: void far closegraph(void); 程序例:

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#include #include #include 3 `& R0 R! G9 a4 t' k#include

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int main(void) / K _# u9 ]8 j$ S5 A{ /* request auto detection */ int 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 */ errorcode = graphresult();

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if (errorcode != grOk) /* an error & w+ R, @4 `/ \3 ?+ aoccurred */ { % `/ G2 S8 E) F; U0 ?& Zprintf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); . @; j2 H* S% B0 Cexit(1); /* terminate with an error code */ }

x = getmaxx() / 2; y = getmaxy() / 2;

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

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/* wait for a key */ - }& y3 f5 Y1 [" lgetch();

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

printf("We're now back in text mode.\n"); printf("Press any key to halt:"); getch(); return 0; ( k: `/ e3 `' H3 S" E}

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函数名: clreol / M5 c; @' A, b! Z/ ^2 Z功 能: 在文本窗口中清除字符到行末 , J5 J8 f: V" n; k4 k+ ]7 q# l用 法: void clreol(void); u- `7 O1 i2 |( l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"); 6 N& T- G- [1 K# S2 v9 }/ Ocprintf("current text window, without moving the cursor.\r\n"); $ U/ E5 E. [) c, v& ~1 U' K- ecprintf("Press any key to continue . . ."); - U/ w/ }5 d1 Ugotoxy(14, 4); getch();

clreol(); " L+ s! {9 E/ X% I& |getch();

return 0; ; K& G: x& Z3 D4 K} . X: Y; O; V) P1 C $ o% a, Q4 C8 N1 c: g& r8 m! ?2 z" H4 e

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函数名: clrscr 0 B" P% @8 `. j. @功 能: 清除文本模式窗口 9 L e# M% d+ C3 V用 法: void clrscr(void); 程序例:

#include

int main(void) { - t% @% L v; Q/ ~, Gint i;

clrscr(); 0 n* d0 V5 e/ Gfor (i = 0; i < 20; i++) cprintf("%d\r\n", i); 6 \9 v. x/ X2 H9 B; ncprintf("\r\nPress any key to clear screen"); " I: O$ d! ^! E2 d7 q- r, Fgetch();

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

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return 0; / ]' x& i6 [% H) c: o8 }} 5 J1 ?0 b, U8 T z3 w2 v; O ! J5 |' R( p0 I! ] : ~3 X C# ?8 F# i6 h# K2 F

函数名: coreleft 功 能: 返回未使用内存的大小 1 t; l' W) `3 F( X6 |6 c. \用 法: unsigned coreleft(void); 程序例:

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#include # m7 c: C2 E$ H4 M#include

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int main(void) { printf("The difference between the highest allocated block and\n"); / j% m, E. ?/ B5 t8 }3 |, Yprintf("the top of the heap is: %lu bytes\n", (unsigned long) coreleft());

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return 0; } % f6 ?% W8 B, J, x7 X; ]

函数名: cos # R; A& q0 [9 E- t8 Q功 能: 余弦函数 : s7 H& L, v* @ N# z9 z- L' X用 法: double cos(double x); 程序例:

#include t& i- M- Q- v1 D$ \# f" Q6 z5 }#include

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int main(void) { 4 W1 r B% S4 u2 \6 D' udouble result; double x = 0.5;

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result = cos(x); printf("The cosine of %lf is %lf\n", x, result); , A l! c0 A7 h+ }3 Z8 sreturn 0; } , z4 X" `* e) ?/ J/ s, v4 j2 s ) p7 a) U- m0 M $ z# l/ K, m& o0 |) i7 C

函数名: cosh 功 能: 双曲余弦函数 用 法: dluble cosh(double x); 程序例:

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#include #include

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int main(void) { & f6 H# J9 {' e' Kdouble result; double x = 0.5;

result = cosh(x); printf("The hyperboic cosine of %lf is %lf\n", x, result); . }% p5 `* g4 ] K: Ereturn 0; 3 \, w! _9 Y3 ~$ I. u: a}

函数名: country 功 能: 返回与国家有关的信息 0 P5 D6 E/ H& c/ t' R& a用 法: struct COUNTRY *country(int countrycode, struct country *country); : P* ]2 d( O' g3 ?! ]; Z% S9 `* J( t" S% A程序例:

#include . R: K; N* I6 I/ w& |% O#include

#define USA 0

int main(void) { struct COUNTRY country_info;

country(USA, &country_info); 2 h, w7 @% V; S8 J* M. r% ^$ M: `printf("The currency symbol for the USA is: %s\n", country_info.co_curr); ) p1 z# @6 C2 F1 m+ @return 0; } 6 R; a2 U5 ?' U4 p: K3 {

函数名: cprintf 功 能: 送格式化输出至屏幕 用 法: int cprintf(const char *format[, argument, ...]); 3 }; z% @4 d6 k$ r' _ u程序例:

#include

int main(void) { 0 X* r+ u, p; i/* clear the screen */ clrscr();

/* create a text window */ 0 h" v* u3 }! E/ \' Hwindow(10, 10, 80, 25);

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

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/* wait for a key */ 4 T X0 g( ]0 ^5 c9 H! l/ ?getch(); & g: e5 Z9 y, K5 `return 0; 6 P) W+ n: C* W2 m1 Q! ] x9 B} - R+ l/ J' o: Z6 j7 _# A

函数名: cputs 功 能: 写字符到屏幕 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 */ clrscr();

/* create a text window */ 3 ?- L3 [# X/ ^; h7 Vwindow(10, 10, 80, 25);

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/* output some text in the window */ 2 _+ L$ a* J5 C1 Ecputs("This is within the window\r\n");

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/* wait for a key */ getch(); 5 G8 O* e# g/ h- [+ [( ]return 0; + D3 x# R+ w$ R8 a} 5 x* ^2 e, a5 l/ S# |9 M } - h4 g2 w; |$ V5 s9 J * O$ B: w( e/ N

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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 2 x' c9 e/ T/ o9 b用 法: int creat (const char *filename, int permiss); . J. K) R1 E2 P m. w程序例:

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#include #include #include 8 }% O5 y, G& `4 O& h#include

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

/* change the default file mode from text to binary */ 1 H% f; o7 q, z: {- u_fmode = O_BINARY;

/* create a binary file for reading and writing */ 8 l; N9 K, z$ {: ^5 ^- yhandle = creat("DUMMY.FIL", S_IREAD | S_IWRITE);

/* write 10 bytes to the file */ . c; J8 p4 J0 V5 g1 bwrite(handle, buf, strlen(buf));

/* close the file */ close(handle); 3 O' h6 A1 D& L4 a' L1 z; f* Areturn 0; 6 a% X) |6 W; U' W' E}

函数名: creatnew 5 k! c; {& w: x, u8 y功 能: 创建一个新文件 ! ]) z m7 e% H7 H用 法: int creatnew(const char *filename, int attrib); 3 I6 m# [" b! K1 J$ P: x程序例:

#include #include #include ' Y. e6 `" y1 I) y7 s#include #include

int main(void) { & c' [9 S! o' r0 I* e! Q% b8 [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) printf("DUMMY.FIL already exists.\n"); 8 l6 S- O: T/ z: belse { . y1 Y9 y" P) y( s8 s0 p* Hprintf("DUMMY.FIL successfully created.\n"); - F% K9 z$ {) Jwrite(handle, buf, strlen(buf)); close(handle); 4 V! m' [5 O/ K& ^/ S} , _1 t8 R& y( p, preturn 0; } * S. i+ f7 @8 S; z$ S2 k

函数名: creattemp - _- I+ b, G; u0 A# ?: B功 能: 创建一个新文件或重写一个已存在的文件 7 M7 H- p( c- e, G用 法: int creattemp(const char *filename, int attrib); 程序例:

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#include #include #include

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int main(void) 8 o" e/ ]# {, k% ?{ 7 V& {1 C {& K; o Q* F$ i7 {; Jint handle; 5 O; D& h8 M/ M) w' h* ]; Achar pathname[128];

strcpy(pathname, "\\");

/* create a unique file in the root directory */ - |- ^# ~* ^; X1 Dhandle = creattemp(pathname, 0);

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printf("%s was the unique file created.\n", pathname); + \. n2 V6 `. X. t; u6 a$ l# dclose(handle); return 0; } % i6 b8 R; G6 q- [( x$ A/ Z # i7 ^3 ^- D/ x7 Q3 g, ]

函数名: cscanf $ {& _/ B! V9 A9 A. @" Z功 能: 从控制台执行格式化输入 0 S% v1 `; J0 }1 H l' ^" o用 法: int cscanf(char *format[,argument, ...]); 程序例:

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#include

int main(void) { 3 u# ^5 h1 J& _" g) @3 ~- Kchar string[80];

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/* clear the screen */ % Y0 B( x3 ~$ w. v: ]" x' _clrscr();

/* Prompt the user for input */ , r9 C% L) k& G- N6 Lcprintf("Enter a string with no spaces:");

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/* read the input */ 7 t% W+ s+ \3 Z6 j7 zcscanf("%s", string);

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/* display what was read */ cprintf("\r\nThe string entered is: %s", string); , c. I2 |! V/ r [6 \# xreturn 0; }

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函数名: ctime * m9 s/ b0 f- X, g+ M5 f功 能: 把日期和时间转换为字符串 2 F6 ] g% q9 M$ K3 h! ~用 法: char *ctime(const time_t *time); 程序例:

#include #include

int main(void) { g5 o% @/ z0 a. Q8 f6 W3 }3 ytime_t t;

time(&t); 9 V; d5 G! Z/ q& V1 [printf("Today's date and time: %s\n", ctime(&t)); return 0; + _9 T2 f" G. k- b( K5 _}

函数名: ctrlbrk 功 能: 设置Ctrl-Break处理程序 : G& }! }! g, ^6 h4 V$ J! w用 法: void ctrlbrk(*fptr)(void); 程序例:

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#include , P2 X: G- Q/ c' ~ J#include

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#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) - N3 [ V: V$ o* b. Z# y8 j7 a{ ' y1 a n4 H6 @2 g9 M5 } U' wctrlbrk(c_break); for(;;) z: @! a! j1 O2 G{ printf("Looping... Press to quit:\n"); % x; D# v1 [2 D( M! O} return 0; }

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