[编程入门]字符串分类统计-题解(C++代码)

简单的做法
#include<bits/stdc++.h>
using namespace std;
  int main(){
  	int letter=0,number=0,blank=0,others=0,c;
  	while ((c=getchar())!='\n') {
  		if('A'<=c&&'Z'>=c||'a'<=c&&'z'>=c) 
  		letter++;
  		else if ('0'<=c&&'9'>=c)
  		number++;
  		else if (c==' ')
  		blank++;
  		else 
  		others++;
	  }
	  cout<<letter<<" "<<number<<" "<<blank<<" "<<others<<endl;
  	return 0;
  }