//分别计算字符串中英文、空格、数字和其它符号的个数
#include<stdio.h>
int main()
{char c;int letters=0,spaces=0,digits=0,others=0;printf("输入字符：\n");while((c=getchar())!='\n'){if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))letters++;else if(c>='0'&&c<='9')digits++;else if(c==' ')spaces++;else others++;}printf("字母=%d,数字=%d,空格=%d,其它=%d\n",letters,digits,spaces,others);return 0;}