📄 王大刚--c语言编程宝典--l.htm
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<P>函数名: labs <BR>功 能: 取长整型绝对值 <BR>用 法: long labs(long n);
<BR>程序例: <BR>
<P>#include <stdio.h> <BR>#include <math.h> <BR>
<P>int main(void) <BR>{ <BR> long result; <BR>
long x = -12345678L; <BR>
<P> result= labs(x); <BR> printf("number: %ld abs
value: %ld\n", <BR> x, result); <BR>
<P> return 0; <BR>} <BR> <BR> <BR> <BR>
<P>函数名: ldexp <BR>功 能: 计算value*2的幂 <BR>用 法: double
ldexp(double value, int exp); <BR>程序例: <BR>
<P>#include <stdio.h> <BR>#include <math.h> <BR>
<P>int main(void) <BR>{ <BR> double value; <BR>
double x = 2; <BR>
<P> /* ldexp raises 2 by a power of 3
<BR> then multiplies the result by
2 */ <BR> value = ldexp(x,3); <BR>
printf("The ldexp value is: %lf\n", <BR>
value); <BR>
<P> return 0; <BR>} <BR> <BR> <BR>
<P>函数名: ldiv <BR>功 能: 两个长整型数相除, 返回商和余数 <BR>用 法: ldiv_t
ldiv(long lnumer, long ldenom); <BR>程序例: <BR>
<P>/* ldiv example */ <BR>
<P>#include <stdlib.h> <BR>#include <stdio.h> <BR>
<P>int main(void) <BR>{ <BR> ldiv_t lx; <BR>
<P> lx = ldiv(100000L, 30000L); <BR>
printf("100000 div 30000 = %ld remainder %ld\n", lx.quot, lx.rem);
<BR> return 0; <BR>} <BR> <BR> <BR> <BR>
<P>函数名: lfind <BR>功 能: 执行线性搜索 <BR>用 法: void *lfind(void *key,
void *base, int *nelem, int width, <BR> int
(*fcmp)()); <BR>程序例: <BR>
<P>#include <stdio.h> <BR>#include <stdlib.h> <BR>
<P>int compare(int *x, int *y) <BR>{ <BR> return( *x - *y );
<BR>} <BR>
<P>int main(void) <BR>{ <BR> int array[5] = {35, 87, 46, 99,
12}; <BR> size_t nelem = 5; <BR> int key;
<BR> int *result; <BR>
<P> key = 99; <BR> result = lfind(&key, array,
&nelem, <BR> sizeof(int),
(int(*)(const void *,const void *))compare); <BR> if (result)
<BR> printf("Number %d found\n",key);
<BR> else <BR> printf("Number %d
not found\n",key); <BR>
<P> return 0; <BR>} <BR> <BR> <BR>
<P>函数名: line <BR>功 能: 在指定两点间画一直线 <BR>用 法: void far line(int
x0, int y0, int x1, int y1); <BR>程序例: <BR>
<P>#include <graphics.h> <BR>#include <stdlib.h> <BR>#include
<stdio.h> <BR>#include <conio.h> <BR>
<P>int main(void) <BR>{ <BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode; <BR>
int xmax, ymax; <BR>
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, ""); <BR>
<P> /* read result of initialization */ <BR>
errorcode = graphresult(); <BR> /* an error occurred */
<BR> if (errorcode != grOk) <BR> {
<BR> printf("Graphics error: %s\n",
<BR>
grapherrormsg(errorcode)); <BR>
printf("Press any key to halt:"); <BR>
getch(); <BR> exit(1); <BR> }
<BR>
<P> setcolor(getmaxcolor()); <BR> xmax =
getmaxx(); <BR> ymax = getmaxy(); <BR>
<P> /* draw a diagonal line */ <BR> line(0, 0,
xmax, ymax); <BR>
<P> /* clean up */ <BR> getch(); <BR>
closegraph(); <BR> return 0; <BR>} <BR> <BR> <BR>
<P>函数名: linerel <BR>功 能: 从当前位置点(CP)到与CP有一给定相对距离的点画一直线 <BR>用 法:
void far linerel(int dx, int dy); <BR>程序例: <BR>
<P>#include <graphics.h> <BR>#include <stdlib.h> <BR>#include
<stdio.h> <BR>#include <conio.h> <BR>
<P>int main(void) <BR>{ <BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode; <BR>
char msg[80]; <BR>
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, ""); <BR>
<P> /* read result of initialization */ <BR>
errorcode = graphresult(); <BR> if (errorcode != grOk)
<BR> { <BR> printf("Graphics
error: %s\n", <BR> grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); <BR> } <BR>
<P> /* move the C.P. to location (20, 30) */ <BR>
moveto(20, 30); <BR>
<P> /* create and output a <BR>
message at (20, 30) */ <BR> sprintf(msg, " (%d, %d)", getx(),
gety()); <BR> outtextxy(20, 30, msg); <BR>
<P> /* draw a line to a point a relative
<BR> distance away from the current
<BR> value of C.P. */
<BR> linerel(100, 100); <BR>
<P> /* create and output a message at C.P. */ <BR>
sprintf(msg, " (%d, %d)", getx(), gety()); <BR> outtext(msg);
<BR>
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