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 cc;
    int count = 0;
    cin >> cc;
    while (cc == ' ') {
        cout << "reinput!" << endl;
        cin >> cc;
    }
    if (cc >= 'A' && cc <= 'Z')
        cc = cc + 32;
    for (int i = 0; i < str.length(); i++) {
        if (str[i] >= 'A' && str[i] <= 'Z')
            str[i] = str[i] + 32; //转换为小写
        if (str[i] == cc) {
            count++;
        }
    }
    cout << count;
    return 0;
}