题解 | #计算某字符出现次数#

#include <cctype>
#include <iostream>
#include<string>
#include<ctype.h>
using namespace std;

int main() {
    std::string line;
    getline(cin, line);
    char object;
    cin>>object;
    int count = 0;
    if (isalpha(object)){
        for (size_t i = 0; i < line.length(); i++) {
            if (line[i] >= 'A' && line[i] <= 'Z') {
                line[i] = line[i] + 32;
            }
        }
       object = tolower(object);
    }
    for (size_t i = 0; i < line.length(); i++) {
        if (object == line[i]) {
            count++;
        }
    }

    std::cout << count << std::endl;
}
// 64 位输出请用 printf("%lld")