题解 | #统计字符# 逻辑判断+ASCII理解

#include <iostream>
using namespace std;

int main() {
    string st;
    getline(cin,st);
    int n = st.size(), letters = 0, blanks = 0, numbers = 0, others = 0;
    for(int i=0; i<n; i++){
        if((st[i] >= 'a' && st[i] <= 'z') || (st[i] >= 'A' && st[i] <= 'Z')){
            letters++;
        }
        else if(st[i] == ' '){
            blanks++;
        }
        else if((st[i] >= '0') && (st[i] <= '9')){
            numbers++;
        }
        else{
            others++;
        }
    }
    cout << letters << endl;
    cout << blanks << endl;
    cout << numbers << endl;
    cout << others << endl;
    return 0;
}
// 64 位输出请用 printf("%lld")