函数大全(c开头)

韩冰

函数大全(c开头) ) F; j0 m1 _. {

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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); 程序例:

#include 6 T* O# v7 _$ j! N6 Q( H7 ?1 S#include

int main(void) + c' I* ]) i: C1 V7 ]" I{ 0 M$ U& U* n8 Lstruct complex z; double val;

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z.x = 2.0; 7 v- c, W8 ]5 x$ K# qz.y = 1.0; val = cabs(z);

printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); " D- D7 r" X1 E7 q, Ereturn 0; ( \1 d& _# h, A% I, n} 9 K, y- I w8 T7 G( x0 N2 T% {

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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:

#include #include

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

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/* allocate memory for string */ 2 `/ `, w0 k( Z/ `: J; Astr = calloc(10, sizeof(char));

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

/* display string */ - E: E0 n y+ h; U' m& K# u, ^- Tprintf("String is %s\n", str);

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/* free memory */ free(str);

return 0; } - P( B1 [, ~2 `' I' N+ c$ Y- c % J3 z% P: `5 s

函数名: ceil 功 能: 向上舍入 用 法: double ceil(double x); ; U: Q5 j$ B' }程序例:

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#include #include

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int main(void) { g+ z% D) F- P$ U( L3 mdouble number = 123.54; double down, up;

down = floor(number); % ~$ i: \% v J# `5 _6 R/ o% mup = ceil(number);

printf("original number %5.2lf\n", number); 9 F4 Q2 }2 t' F p2 Cprintf("number rounded down %5.2lf\n", down); 6 S- {. ?5 K- g+ y! R. wprintf("number rounded up %5.2lf\n", up);

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return 0; } * b' m, V; ]% y* ~, X; O: H9 O . `9 K: [) G/ D# b8 h

函数名: cgets 4 T& T! B& d" p功 能: 从控制台读字符串 4 e1 d1 r1 y* G, s用 法: char *cgets(char *str); 程序例:

#include 1 F( s% U; H* i#include

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int main(void) { char buffer[83]; char *p;

/* There's space for 80 characters plus the NULL terminator */ * J2 q8 v7 N) V0 w: @0 ibuffer[0] = 81;

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printf("Input some chars:"); - n; @0 [6 i; tp = cgets(buffer); 3 B/ D/ Y! d) R- J. w7 Cprintf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); 5 j( }- Q/ ~' ~! Q$ ~% O/ ?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:"); 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); return 0; 7 f: H, F. I; f6 M# P2 D} ; s9 x, G; ?1 m5 z

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函数名: chdir 6 z d. m& j* g4 o' J0 Q) `3 j" }功 能: 改变工作目录 * p# N3 F ?, S用 法: int chdir(const char *path); 6 ]2 o$ T# G' B% r' F3 J6 Y程序例:

#include 4 P4 |3 J5 {) H#include #include

char old_dir[MAXDIR]; " z5 W7 s* j; U3 s1 D2 Echar new_dir[MAXDIR];

int main(void) { if (getcurdir(0, old_dir)) { 5 @4 r( E+ Y7 C+ Wperror("getcurdir()"); exit(1); } printf("Current directory is: \\%s\n", old_dir);

if (chdir("\\")) ) x, H7 d: j3 M2 Z# I) P9 q/ i{ 8 c% ^" f6 S& Z1 Lperror("chdir()"); exit(1); }

if (getcurdir(0, new_dir)) # P$ \5 Z$ R! C3 q7 n$ p" y{ perror("getcurdir()"); exit(1); } printf("Current directory is now: \\%s\n", new_dir);

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printf("\nChanging back to orignal directory: \\%s\n", old_dir); ! h T9 k' G3 `" o% }1 Bif (chdir(old_dir)) 7 K0 Y1 p$ s& }" O% c6 b' |{ 9 n6 g" `; i+ v e. p @perror("chdir()"); ! C+ _& E8 W W3 U4 ?9 F( ]exit(1); : A7 T- o, E2 `* y/ l3 e. [2 O}

return 0; } 1 Y' U+ }3 p: N2 b. H' p" N* X+ i

函数名: _chmod, chmod + o) r2 u+ c5 N# a6 }功 能: 改变文件的访问方式 用 法: int chmod(const char *filename, int permiss); 7 H7 N: O: D* e0 |* H程序例:

#include 3 C( I$ J+ j1 u% s4 E1 O7 t#include #include

void make_read_only(char *filename);

int main(void) 2 Z: m8 ]* L& [8 ?; T{ make_read_only("NOTEXIST.FIL"); make_read_only("MYFILE.FIL"); ! j3 O" i6 ^3 G H- Nreturn 0; }

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void make_read_only(char *filename) 7 h& b1 @! P- R& q{ ; i: E% ~) T2 W; m" `int stat;

stat = chmod(filename, S_IREAD); if (stat) x+ w' e v- Wprintf("Couldn't make %s read-only\n", filename); 1 s" x) T' c' a' aelse printf("Made %s read-only\n", filename); ( h/ A' E' O' X3 B9 P! |} ) y) A2 _3 s e5 G6 v/ _( W . f& o+ K% [7 H, l2 q( ]

函数名: chsize 功 能: 改变文件大小 4 I z3 E! L2 ?3 @0 i$ `& w用 法: int chsize(int handle, long size); 程序例:

#include Q: q4 b+ O- Z0 q5 H* u#include #include

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int main(void) 2 R( B" K: n9 F/ r2 F4 F{ - x3 M6 e' v4 Gint handle; + _# \* E: \# O# f' O1 r# Tchar buf[11] = "0123456789";

/* create text file containing 10 bytes */ ) w9 n& B8 N+ l/ ahandle = open("DUMMY.FIL", O_CREAT); + ]1 F% N7 y0 p7 {6 }- C$ }6 Nwrite(handle, buf, strlen(buf));

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/* truncate the file to 5 bytes in size */ # Q! D( g% g" b2 `3 u) Gchsize(handle, 5);

/* close the file */ close(handle); 2 e4 s9 C) r7 p" Q6 ]' Q0 k- Nreturn 0; } ' A- Y: B2 R2 \* I) S " q2 P" T1 t6 d0 ^5 F

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函数名: circle 5 G3 O2 G6 D" T8 l, V% E6 R功 能: 在给定半径以(x, y)为圆心画圆 用 法: void far circle(int x, int y, int radius); 程序例:

#include / R, V/ p0 s6 o9 x8 }& ?% y9 x) y#include #include v# G$ D/ o1 m2 l#include

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int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy; int radius = 100;

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/* initialize graphics and local variables */ " L1 U1 u) t. f1 Q9 x2 Ainitgraph(&gdriver, &gmode, "");

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/* read result of initialization */ errorcode = graphresult(); # e7 y X- M3 K6 g6 |& c6 Dif (errorcode != grOk) /* an error occurred */ 6 I/ Q- Z. E% ~8 C/ D8 [{ printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); & i7 ]+ i8 J) W! q. Z# Jexit(1); /* terminate with an error code */ ) ^4 ^7 j/ m5 T7 u6 }# x# L2 V}

midx = getmaxx() / 2; ' C+ T9 j% A& B/ C9 X( b' tmidy = getmaxy() / 2; ) t6 p/ i- _1 F- H/ wsetcolor(getmaxcolor());

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

/* clean up */ getch(); closegraph(); ' m* V0 e: H- Hreturn 0; / _% s( O( q" Y" M} / i; K3 ~ n6 d0 A2 [

函数名: cleardevice ' E' |( k# `! Z- s! F, \- h# ^功 能: 清除图形屏幕 用 法: void far cleardevice(void); 程序例:

#include #include ) O+ K! e% [. m) f- n! L! s#include + L$ W% G2 h7 x( t; o, o#include

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int main(void) { ' R b" W4 u' f1 x( y. t/* request auto detection */ \2 l" j6 L: q" Wint gdriver = DETECT, gmode, errorcode; int midx, midy;

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/* initialize graphics and local variables */ $ S4 O) k8 s5 H$ v0 x* B+ uinitgraph(&gdriver, &gmode, "");

/* read result of initialization */ & g) w% q4 h. f2 s0 T1 merrorcode = graphresult(); 7 ?4 @8 j& l8 e! @+ wif (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); : [1 Y; N* J, E( @' igetch(); 7 W+ B8 r; t: {! Pexit(1); /* terminate with an error code */ 9 D9 m2 \9 p0 `}

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midx = getmaxx() / 2; 6 _3 U4 e" ^! I; f$ ~midy = getmaxy() / 2; % w9 T% \; E# |" Ysetcolor(getmaxcolor());

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/* for centering screen messages */ $ y! I2 j5 ?7 i- S; Wsettextjustify(CENTER_TEXT, CENTER_TEXT);

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

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

/* clear the screen */ 3 c4 b3 H0 W9 s8 Y0 y) Vcleardevice();

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/* output another message */ 2 D' `, k: x6 U0 p% M0 c! houttextxy(midx, midy, "press any key to quit:");

/* clean up */ getch(); closegraph(); % N K) p+ f4 n/ W, p* _$ {1 Rreturn 0; } ( s/ F; d: q- K. P7 O& ?% X% b

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函数名: clearerr " G! K% n W# L7 G2 h功 能: 复位错误标志 L3 C- q* O& G7 _2 D# Q用 法:void clearerr(FILE *stream); 程序例:

#include

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int main(void) ) y. O D* ?1 a{ / i `$ d. J bFILE *fp; ) Z7 K! K: L4 t8 k; o) pchar ch;

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/* open a file for writing */ & ?" E! i* O9 ?fp = fopen("DUMMY.FIL", "w");

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/* force an error condition by attempting to read */ 0 s" P6 }3 G( j2 x0 P3 Pch = fgetc(fp); printf("%c\n",ch);

if (ferror(fp)) . S, b# U& R! |+ ~* n$ a C{ /* display an error message */ printf("Error reading from DUMMY.FIL\n");

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

fclose(fp); return 0; } + Y4 |; T. t# g# {. k

函数名: clearviewport , j5 ~5 J5 U& V( }' h功 能: 清除图形视区 用 法: void far clearviewport(void); 程序例:

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#include #include % Q* G" C; A4 h Q+ X- y#include : L- b. n1 Q8 t/ _: E% [# g#include

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

int main(void) & L. j- l& I% V2 C5 H{ /* request auto detection */ 9 f5 K+ _. y4 W3 b1 t" o+ hint gdriver = DETECT, gmode, errorcode; int ht;

/* initialize graphics and local variables */ - Z9 }/ s3 I& linitgraph(&gdriver, &gmode, "");

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/* read result of initialization */ errorcode = graphresult(); 1 c: o& V/ ]; L" B# Y& Lif (errorcode != grOk) /* an error occurred */ & U! m c0 q% ~1 v" a$ u+ X{ 4 `$ ~+ f2 f P1 a+ \8 ~4 |- Yprintf("Graphics error: %s\n", grapherrormsg(errorcode)); , |- {. ^- @3 |5 _- Lprintf("Press any key to halt:"); + S* b6 Z3 q: R! S) v& c" `2 Pgetch(); exit(1); /* terminate with an error code */ # [7 p# O1 t/ ] T6 w! w}

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

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

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/* create a smaller viewport */ 9 `" E k8 h5 f- S1 ^# H5 J" O1 bsetviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);

/* display some messages */ outtextxy(0, 0, "* <-- (0, 0) in smaller viewport"); - W F/ Q6 [; W; d& p; v7 ^! Louttextxy(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:");

/* clean up */ * k0 \: G7 _, N9 sgetch(); ! g+ P7 I" [$ |- n6 }- Oclosegraph(); return 0; } ) f$ X. C4 h4 u( o+ ?5 [! K' c

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函数名: _close, close ^- g+ ?& n2 `: K功 能: 关闭文件句柄 用 法: int close(int handle); * c( c: B9 t: z( p! i& t. s程序例:

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#include #include " D/ n: J2 o+ C. r#include #include

main() , y7 h, C* K! P' b{ int handle; char buf[11] = "0123456789";

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/* create a file containing 10 bytes */ handle = open("NEW.FIL", O_CREAT); if (handle > -1) I4 { v, {" J{ write(handle, buf, strlen(buf));

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/* close the file */ close(handle); } else 1 X! ^+ u* P8 D3 ~{ printf("Error opening file\n"); } return 0; } 1 I+ b, D$ u) C) B! {# T0 A4 o6 f * l; [8 n8 r, U1 k! W. x( y

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函数名: clock 功 能: 确定处理器时间 + `: r4 [' |5 V( P0 v# [用 法: clock_t clock(void); 程序例:

#include ( x' e+ [8 m' }9 M# y0 C#include 4 C6 E5 l" J Q- \/ M#include

int main(void) ( P2 @$ T- D w5 J$ K6 G8 h8 e& T{ : l& j5 z0 r: ~" P2 bclock_t start, end; 1 E/ V/ n: e' d- l' Q$ L+ N( pstart = 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; } ' C7 S: T% G" g# x5 e& }; _1 I 5 a' p% I! X9 [( x3 u7 k M$ X0 i9 P

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函数名: closegraph 功 能: 关闭图形系统 用 法: void far closegraph(void); 5 K) |& B' Q% E8 h, p. U0 S5 W. K程序例:

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#include #include #include 5 a ~9 C; f! W4 v- ]1 y: S% {* R6 v#include

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int main(void) # [% i& M9 c9 w3 F+ j{ /* request auto detection */ int gdriver = DETECT, gmode, errorcode; 3 _6 |+ M+ {2 V* I2 h$ T1 Jint x, y;

/* initialize graphics mode */ : D! H: q- i4 Q; minitgraph(&gdriver, &gmode, "");

/* read result of initialization */ + ?# q. n8 A+ j3 t/ Ierrorcode = graphresult();

if (errorcode != grOk) /* an error occurred */ ~" C; s- Y( Z% E, }2 x3 o: [1 b3 E{ 0 t8 E# ^- g3 h/ T9 m. a* mprintf("Graphics error: %s\n", grapherrormsg(errorcode)); / @9 P0 \ k7 C2 f3 i4 I- Iprintf("Press any key to halt:"); $ i! b8 B4 t& u% F5 rgetch(); 0 D" n8 a- M2 nexit(1); /* terminate with an error code */ 7 n' H3 R6 E9 X3 O) B}

x = getmaxx() / 2; # d$ Y, ~ p3 Zy = getmaxy() / 2;

/* output a message */ * ^+ W! ?( d! l7 o3 ^6 ksettextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "Press a key to close the graphics system:");

/* wait for a key */ , \7 W2 z; T# d1 }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(); ) ]5 B; b9 V2 a+ vreturn 0; }

函数名: clreol 功 能: 在文本窗口中清除字符到行末 ' O, E7 }* R6 k, d用 法: void clreol(void); 程序例:

#include

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int main(void)

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{ clrscr(); 4 N! O" y/ |6 n3 Q2 d9 a* Jcprintf("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"); ! l+ K S: s) W6 Gcprintf("Press any key to continue . . ."); P: ? V5 R2 kgotoxy(14, 4); 9 `& @/ Q3 ^; l7 d) c8 Y; N/ Rgetch();

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clreol(); 4 l, W; k W' t, {1 Ygetch();

return 0; 3 w0 H: C: ]7 L} " r9 k& [$ i: d) Q9 _ ; s z# p- w! u& s

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函数名: clrscr 功 能: 清除文本模式窗口 用 法: void clrscr(void); ) c0 D7 J6 x, L- U+ U: s3 U7 z8 R程序例:

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#include

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int main(void) % d- \3 R; v" G{ int i;

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clrscr(); * s# s1 Z0 E/ N% Efor (i = 0; i < 20; i++) ) U+ q5 N* i4 S& |cprintf("%d\r\n", i); & U2 N" R9 d- L% d; \cprintf("\r\nPress any key to clear screen"); getch();

clrscr(); cprintf("The screen has been cleared!"); 0 g* ~; C7 i4 u) ^! d& Ugetch();

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return 0; a+ s+ v# v; L' V} - f2 n6 r( k" c* s& Z5 R8 R4 u$ _

函数名: coreleft * z9 S( M/ h. p) d! F功 能: 返回未使用内存的大小 % U: ]9 O$ h, X; W8 N* i2 ?用 法: unsigned coreleft(void); + L! i6 ~1 k6 ]/ b8 P8 k程序例:

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#include ) X# f7 D6 }2 J( X! }7 { ?#include

int main(void) 0 N! O ~, [& D{ 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; ) N5 @) s! A0 n: d8 r+ L1 K) E}

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函数名: cos 功 能: 余弦函数 1 C: R# F% J8 U; U/ ?0 B用 法: double cos(double x); 程序例:

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#include $ }* V5 @5 `0 g0 `#include

int main(void) ! [/ C$ Q$ I8 p' f9 N{ 4 x8 [; D- D: M% R& [double result; - ]/ B( n& ~2 b# r/ V7 ?4 ^8 P+ f# Gdouble x = 0.5;

result = cos(x); printf("The cosine of %lf is %lf\n", x, result); ' d: ]/ ^/ s8 _6 W9 oreturn 0; 4 A5 p# r/ k! h( I( \} 6 ]8 E5 P, |0 B8 t ' n4 o' m9 _) `! q6 o8 {( i

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函数名: cosh $ m6 J& X" C( r, z8 O+ c, F' o功 能: 双曲余弦函数 - I: P+ k5 ]% d0 j) e$ k8 M. U用 法: dluble cosh(double x); 程序例:

#include % y5 R: v7 d* } }" z#include

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int main(void) ! x! [" j9 G0 C0 a{ double result; 1 J, n1 p" n) k5 {$ m) W% V/ fdouble x = 0.5;

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result = cosh(x); printf("The hyperboic cosine of %lf is %lf\n", x, result); return 0; } 3 `. a+ N8 k/ i; I/ u) p4 l( U 6 g8 |1 n' A- ~3 N3 h: a" j3 O - Q/ I3 ~3 h ^/ O

函数名: country 3 m9 Z _# Q" {% t. N' ]& g: M% U1 \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:

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#include #include

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#define USA 0

int main(void) ' c( t, {% x' j- z{ + q) F* e: [; \4 {: J/ Fstruct COUNTRY country_info;

country(USA, &country_info); : w2 D% @8 J& J. V7 U V" sprintf("The currency symbol for the USA is: %s\n", 4 s/ a, A( `- Z W; S, Zcountry_info.co_curr); return 0; ; y8 X: G K9 `} ! Z* C" v& V$ J6 m% L+ B; X' m o/ z$ l / I$ G3 L) x1 \+ v2 V$ X

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函数名: cprintf 功 能: 送格式化输出至屏幕 1 _+ u Y" P$ t6 u! _用 法: int cprintf(const char *format[, argument, ...]); 程序例:

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#include

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int main(void) { ; N: a5 e' s* N: M! H/* clear the screen */ clrscr();

/* create a text window */ ) e0 e, {8 k& L) L& ~4 r- U/ ~- }window(10, 10, 80, 25);

/* output some text in the window */ ) P1 N4 T, q. _- q+ d* }cprintf("Hello world\r\n");

/* wait for a key */ * Z$ }4 B2 `, p+ Xgetch(); 1 z j: G% o i: E [0 N' zreturn 0; }

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函数名: cputs 功 能: 写字符到屏幕 用 法: void cputs(const char *string); 4 Y X- k! p5 N+ U程序例:

#include

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int main(void) { /* clear the screen */ clrscr();

/* create a text window */ ' V! Y2 s; H6 b: zwindow(10, 10, 80, 25);

/* output some text in the window */ 3 y i4 j& z( x ~cputs("This is within the window\r\n");

/* wait for a key */ & M; S* H! \2 j, o0 u- A5 rgetch(); " F* N3 j, O, o# M, @3 l4 _( ureturn 0; } 4 s0 `' t/ I3 @0 q% x 3 S2 h2 ^2 q l+ F1 n, n1 c/ T

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); ( J% v& N# r, u6 F; {% Z$ v. P( _程序例:

#include " s& h- c# ? L: }#include #include 1 O0 R+ j5 [/ |2 v#include

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int main(void) { # h; t. Z: w* @int handle; / C4 X- ?/ Z8 b0 V9 U/ ~( Ochar buf[11] = "0123456789";

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/* change the default file mode from text to binary */ ; z( J. b' d+ U* `( L4 z- r0 ^_fmode = O_BINARY;

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/* create a binary file for reading and writing */ : S/ _- l) ^0 {+ E$ }4 Mhandle = creat("DUMMY.FIL", S_IREAD | S_IWRITE);

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/* write 10 bytes to the file */ $ y: r. \& {$ @) i$ f: Jwrite(handle, buf, strlen(buf));

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/* close the file */ close(handle); ( O4 x$ s* N) \6 @, X3 J! vreturn 0; / ?8 S/ V \4 o$ Y9 t) ?6 p}

函数名: creatnew 9 Q( y' n, ?6 s H$ [9 }功 能: 创建一个新文件 7 R) b8 [' N4 k( L! w用 法: int creatnew(const char *filename, int attrib); 程序例:

#include ( o$ V) w5 y! Y+ E3 k2 ^#include ; Q, g- e' U) f5 B) m p4 c% D1 A; L#include #include + Z8 l8 ]$ P! s! ^: \#include

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int main(void) # z/ f% Q1 [% L; \: J{ int handle; char buf[11] = "0123456789";

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/* attempt to create a file that doesn't already exist */ : J3 |# S$ c6 P+ N7 Lhandle = creatnew("DUMMY.FIL", 0);

if (handle == -1) printf("DUMMY.FIL already exists.\n"); else { printf("DUMMY.FIL successfully created.\n"); " V0 }$ T, u3 t1 W# c! |9 \write(handle, buf, strlen(buf)); 2 d9 {0 r) [4 M# T) Nclose(handle); } return 0; } " K8 W2 j" f+ z- r. v: S: l' n2 t

函数名: creattemp 6 s, ]) M' \. H7 l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); ; p* S7 k+ @* s: v6 \程序例:

#include 9 h7 S3 a7 q4 I& q#include #include

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int main(void) / ~7 S, \* {$ k0 b& B6 {+ A{ $ r3 H& z* T& ?( gint handle; char pathname[128];

strcpy(pathname, "\\");

/* 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); ' B6 J0 R3 |! s# E+ k3 v# Zclose(handle); return 0; - W/ u) L4 k8 F# S2 }8 j+ S} - o5 g- W3 ]5 c7 a5 i* u( w3 a 9 v2 W" q4 E5 w2 Z. B ( Q( Y0 g K$ |! j! m

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函数名: cscanf + P8 r8 s8 s2 U3 W功 能: 从控制台执行格式化输入 用 法: int cscanf(char *format[,argument, ...]); ! j8 ?' v7 P4 U- K6 O. A# a程序例:

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#include

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int main(void) % {2 B5 H4 x( `5 E+ l8 K{ , l6 T7 S+ `2 ichar string[80];

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/* clear the screen */ % U" e; B9 C9 c6 w0 kclrscr();

/* Prompt the user for input */ 4 ~1 J2 K3 E7 H7 N4 t$ g2 \cprintf("Enter a string with no spaces:");

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

/* display what was read */ cprintf("\r\nThe string entered is: %s", string); ' ?) U7 \1 M- ?" E$ dreturn 0; } : G/ K: x- g9 v/ V* q0 ?

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函数名: ctime 功 能: 把日期和时间转换为字符串 用 法: char *ctime(const time_t *time); 2 f, ?$ S6 |5 T1 l0 [程序例:

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#include #include

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int main(void) { ! U$ P# a, N0 q8 F gtime_t t;

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time(&t); printf("Today's date and time: %s\n", ctime(&t)); return 0; }

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函数名: ctrlbrk 3 D* I+ Y; F, I* Z% X/ T1 s功 能: 设置Ctrl-Break处理程序 9 D) s5 D W: N6 {用 法: void ctrlbrk(*fptr)(void); 8 y; U3 {8 M R X' \程序例:

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#include #include

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#define ABORT 0

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int c_break(void) ' ?* } w1 F5 l{ printf("Control-Break pressed. Program aborting ...\n"); : x) J" s- g/ V5 lreturn (ABORT); & U5 _9 E4 K+ o9 f3 E V, Q: h+ F}

int main(void) + p6 C+ }$ a2 h# h D/ b( E{ & N* v% E1 j3 Ictrlbrk(c_break); for(;;) ) U# G* s' P/ m( v6 i& l{ printf("Looping... Press to quit:\n"); 1 t7 p" R' T. Y9 Y- T, }} % Q' d. B! P- [' ereturn 0; }

hjl19890710hjl

特别感谢

gssdzc

还是感谢分享。。。

chenlk

有价值！

zjf

[em49]

谢谢啊

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