C++ <替换字符串中的数字>

运行结果：

 Enter a string: My userID is john17 and my 4 digit pin is 1234 which is secret. My userID is john17 and my x digit pin is xxxx which is secret.

replaceDigits.cpp

#include <iostream>#include <string>using namespace std;void replaceDigits(string& s);int main() {    string s;    cout << "Enter a string: ";    getline(cin, s);    replaceDigits(s);    cout << s;    return 0;}void replaceDigits(string& s) {    for (int i = 0; i < s.length(); i++) {        if (s[i] == ' ') {            while (isdigit(s[++i])) {                s[i] = 'x';            }        }    }}