//判断，判断是否是字母
#include<stdio.h>
#include<stdlib.h>
int main()
{char c;printf("输入字符：");scanf("%c",&c);if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))  //a~z的ASCLL区间是97-122，A~Z的ASCLL区间是65-90//printf("是字母\n");elseprintf("不是字母\n");system("pause");return 0; }