题解 | #计算某字符出现次数#简单粗暴的C++实现

#include <iostream>
using namespace std;

//利用tolower函数实现字符串的字母全部小写 
string ToLowerStr(string s) {
    string lowerStr;
    for (char c : s) {
        lowerStr += tolower(c);
    }
    return lowerStr;
}
//遍历string，进行比较，注意：此时的目标字符也要全部小写
int CountChar(string s, char c) {
    string lowerStr = ToLowerStr(s);
    char lowerC = tolower(c);
    int count = 0;
    for (int i = 0; i < lowerStr.size(); i++) {
        if (lowerStr[i] == lowerC) {
            count++;
        }
    }
    return count;
}
int main() {
    string s;
    char c;
    getline(cin, s);
    cin >> c;
    int res = CountChar(s, c);
    cout << res;

    return 0;
}
// 64 位输出请用 printf("%lld")