1、提示并输入一个字符串，统计该字符中大写、小写字母个数、数字个数、空格个数以及其他字符个数（要求使用C++风格字符串完成）

#include <iostream>using namespace std;int main()
{string str;cout << "please enter str:" << endl;getline(cin,str);int capital=0,lowercase=0,num=0,space=0,other=0;for(size_t i=0;i<str.size();i++){if('A'<=str[i] && 'Z'>=str[i]){capital+=1;}else if('a'<=str[i] && 'z'>=str[i]){lowercase+=1;}else if('0'<=str[i] && '9'>=str[i]){num+=1;}else if(str[i] == ' '){space+=1;}else{other+=1;}}cout << "capital= " << capital << endl;cout << "lowercase= " << lowercase << endl;cout << "num= " << num << endl;cout << "space= " << space << endl;cout << "other= " << other << endl;return 0;
}

2、思维导图