统计字符串中数字，小写字母，大写字母，空白字符和其他字符的个数

#include<stdio.h> #include<ctype.h> int main() { char str[80]; int i; int digit=0,lower=0,upper=0,space=0,other=0; printf("请输入一行字符串: \n"); fgets(str,sizeof(str),stdin); i=0; while(str[i]!='\0' && str[i]!='\n') { if(isdigit(str[i])) digit++; else if(islower(str[i])) lower++; else if(isupper(str[i])) upper++; else if(isspace(str[i])) space++; else other++; i++; } printf("digit characters: %d\n",digit); printf("lower case letters:%d\n",lower); printf("upper case letters:%d\n",upper); printf("space :%d\n",space); printf("others:%d\n",other); return 0; }