C++已AC代码

逐字符判断并输出

#include<bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin>>n;
    string s;
    cin>>s;
    for(int i=0;i<n;i++){
        if(s[i]>='A'&&s[i]<='Z'){
            cout<<(char)(s[i]+32);
        }
        if(s[i]>='a'&&s[i]<='z'){
            cout<<(char)(s[i]-32);
        }
        if(s[i]>='0'&&s[i]<='9'){
            cout<<'*';
        }
    }
    return 0;
}