题解 | #计算某字符出现次数#

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

int main() {
    string s;
    getline(cin, s);
    char c;
    cin >> c;
    unsigned count = 0;
    if (isalpha(c)) {
        for (const auto& ch : s)
            if (tolower(c) == tolower(ch))
                ++count;
    } else {
        for (const auto& ch : s)
            if (ch == c)
                ++count;
    }
    cout << count << endl;
    return 0;
}
// 64 位输出请用 printf("%lld")