题解 | #计算某字符出现次数#

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

int main() {
    string str;
    getline(cin, str);
    char tar;
    cin >> tar;
    if(tar>='A'&&tar<='Z')tar+=32;

    int ret=0;
    for (int i = 0; i <= str.size() - 1; i++) {
        if (str[i] >= 'A' && str[i] <= 'Z') {
            str[i] += 32;
        }
        if (str[i] == tar)ret++;
    }
    cout<<ret<<endl;
}