题解 | #计算某字符出现次数#

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

int main() {
    string str;
    char s;
    getline(cin,str);
    cin >> s;
    int count = 0;
    for (int i = 0; i < str.size(); i++){
        if ((s >= 65 && s <= 90) || (s >= 97 && s <= 122)) {
            if(str[i] == s || str[i]+32 == s || str[i]-32 == s) count++;
        }
        else{
            if(str[i] == s) count++;
        }
    }
    cout << count << endl;
}
// 64 位输出请用 printf("%lld")