//统计字符的种类和个数
#include <stdio.h>
main()
{
char c;
int letter=0,space=0,digit=0,other=0;
printf("请输入一行字符:\n");
while((c=getchar())!='\n')
{
if(c==' ') space++;
else if(c>='a'&&c<='z'||c>='A'&&c<='Z') letter++;
else if(c>='0'&&c<='9') digit++;
else other++;
}
printf("空格数=%d,字母数=%d,数字数=%d,其他字符数=%d",space,letter,digit,other);
}