用C++中的多个字符替换字符串中的一个字符

string replace(string str, char oldChar, string newStr);

#include <iostream>
#include <string>

using namespace std;

string replaceChar(string str, char oldChar, string newStr) {
    for (int i = 0; i < str.length(); i++) {
        if (str[i] == oldChar) {
            str.replace(i, 1, newStr);
        }
    }
    return str;
}

int main() {
    string str = "Hello, World!";
    char oldChar = 'o';
    string newStr = "123";

    string result = replaceChar(str, oldChar, newStr);
    cout << result << endl;

    return 0;
}

Hell123, W123rld!