day01 1.c++对c的扩充

#include <iostream>using namespace std;int main()
{string s1;cout << "请输入一个字符串：";getline(cin,s1);int count1=0,count2=0,count3=0,count4=0;int len = s1.length();for(int i=0;i<len;i++){if((s1[i]>='a'&&s1[i]<='z') || (s1[i]>='A'&&s1[i]<='Z')){count1++;}else if(s1[i]>= '0'&&s1[i]<= '9'){count2++;}else if(s1[i] == ' '){count3++;}else{count4++;}}cout << "字母个数 ：" << count1<<endl;cout << "数字个数 ：" << count2<<endl;cout << "空格个数 ：" << count3<<endl;cout << "其他个数 ：" << count4<<endl;return 0;
}