题解 | 计算某字符出现次数

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    getline(cin,s);
    char a;
    cin>>a;
    if(a>='A'&&a<='Z'){
        a=a+32;
    }
    int len=s.size(),total=0;
    for(int i=0;i<len;i++){
        if(s[i]>='A'&&s[i]<='Z'){
            s[i]=s[i]+32;
        }
        if(s[i]==a)total++;
    }
    cout<<total;
    return 0;
}