Question

How to mask a number with stars except the first 6 and the last 4 digits in C++

Answer 1

#include <iostream>
#include <string>

std::string maskNumberWithStarsExceptFirstSixAndLastFour(std::string cardNumber) {
    std::string first6Digits = cardNumber.substr(0, 6);
    std::string last4Digits = cardNumber.substr(cardNumber.length() - 4);
    
    std::string requiredMask = std::string(cardNumber.length() - first6Digits.length() - last4Digits.length(), '*');
    
    return first6Digits + requiredMask + last4Digits;
}

int main() {
    std::string cardNumber = "9003125334656789";
    
    std::string maskedNumber = maskNumberWithStarsExceptFirstSixAndLastFour(cardNumber);
    
    std::cout << maskedNumber << std::endl;
}


 
 
/*
run:
 
900312******6789
 
*/

 

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