66_查找函数

//_66_查找函数//_66_main.cpp#include <stdio.h>#include <stdlib.h>#include <ctype.h>char *alpha = "abcdefghijklmnopqrstuvwxyz";int comp(const void *ch,const void *s);int main(){printf("Enter a character: ");char ch=getchar();ch = tolower(ch);//将变元ch转换成小写字符char *p = (char *)bsearch(&ch,alpha,26,1,comp);if(p)printf("%c is in alphabet.\n",*p);elseprintf("is not in alphabet.\n");system("pause");return 0;}int comp(const void *ch,const void *s){return *(char *)ch - *(char *)s;}