题解 | 计算某字符出现次数

#include <cctype>
#include <cstdio>
#include <iostream>
#include <sstream>
#include <string>
using namespace std;

int main() {
    string line;
    // 第一行输入
    getline(cin, line);
    // 字符输入：
    char c;
    cin >> c;
    c = tolower(c);
    int count = -1;

    if (line.size() <= 1000 && line.size() >= 1) {
        count = 0;
        char tmpc;
        for (int i = 0; i != line.size(); ++i) {
            tmpc = line[i];
            tmpc = tolower(tmpc);
            if (c == tmpc)
            {
                ++count;
            }
        }    
    }

    cout << count << endl;
    
    return 0;
}