题解 | #字符的个数#

#include <iostream>
using namespace std;

int main() {
    // 字符串 并接受用户的输入
    string str;
    cin >> str;
    int countA, countB, countC; //定义并初始化三个计次变量
    countA = 0;
    countB = 0;
    countC = 0;
    char* z = &str[0];
    // 开始遍历字符串
    for (int i = 0; i < str.length(); i++) {
        if ( *z == 'a') {
            countA++;
        }
        if (*z == 'b') {
            countB++;
        }
        if (*z == 'c') {
            countC++;
        }
        z++;
    }
    // 输出
    cout << countA << " " << countB << " " << countC;
}