C语言函数大全q，r开头完整版.docVIP

C语言函数大全(q,r开头) 函数名: qsort 功能: 使用快速排序例程进行排序 用法: void qsort(void *base, int nelem, int width, int (*fcmp)()); 程序例: #include#include#includeint sort_function( const void *a, const void *b);char list[5][4] = { cat, car, cab, cap, can };int main(void){int x;qsort((void *)list, 5, sizeof(list[0]), sort_function);for (x = 0; x 5; x++)printf(%s\n, list[x]);return 0;}int sort_function( const void *a, const void *b){return( strcmp(a,b) );} 函数名: qsort 功能: 使用快速排序例程进行排序 用法: void qsort(void *base, int nelem, int width, int (*fcmp)()); 程序例: #include#include#includeint sort_function( const void *a, const void *b);char list[5][4] = { cat, car, cab, cap, can };int main(void){int x;qsort((void *)list, 5, sizeof(list[0]), sort_function);for (x = 0; x 5; x++)printf(%s\n, list[x]);return 0;}int sort_function( const void *a, const void *b){return( strcmp(a,b) );} 函数名: raise 功能: 向正在执行的程序发送一个信号 用法: int raise(int sig); 程序例: #includeint main(void){int a, b;a = 10;b = 0;if (b == 0)/* preempt divide by zero error */raise(SIGFPE);a = a / b;return 0;} 函数名: rand 功能: 随机数发生器 用法: void rand(void); 程序例: #include#includeint main(void){int i;printf(Ten random numbers from 0 to 99\n\n);for(i=0; i10; i++)printf(%d\n, rand() % 100);return 0;} 函数名: randbrd 功能: 随机块读 用法: int randbrd(struct fcb *fcbptr, int reccnt); 程序例: #include#include#include#includeint main(void){char far *save_dta;char line[80], buffer[256];struct fcb blk;int i, result;/* get user input file name for dta */printf(Enter drive and file name (no path - i.e. a:file.dat)\n);gets(line);/* put file name in fcb */if (!parsfnm(line, blk, 1)){printf(Error in call to parsfnm\n);exit(1);}printf(Drive #%d File: %s\n\n, blk.fcb_drive, blk.fcb_name);/* open file with DOS FCB open file */bdosptr(0x0F, blk, 0);/* save old dta, and set new one */save_dta = getdta();setdta(buffer);/* set up info for the new dta */blk.fcb_recsize = 128;blk.fcb_random = 0L;result = randbrd(blk,