February 6, 2023
Credit Card Mask

Belajar Bahasa C – Credit Card Mask

Usually when you buy something, you’re asked whether your credit card number, phone number or answer to your most secret question is still correct. However, since someone could look over your shoulder, you don’t want that shown on your screen. Instead, we mask it.

Your task is to write a function maskify, which changes all but the last four characters into '#'.

The problem link is here.

Examples

"4556364607935616" --> "############5616"
     "64607935616" -->      "#######5616"
               "1" -->                "1"
                "" -->                 ""

// "What was the name of your first pet?"

"Skippy" --> "##ippy"

"Nananananananananananananananana Batman!"
-->
"####################################man!"

Solution

#include <string.h>
char *maskify(char *masked, const char *string)
{
  unsigned long i, slen = strlen(string);
  strcpy(masked, string);
  if (slen > 4)
    for (i = 0; i < slen - 4; i++)
      masked[i] = '#';
  return masked; // return it
}

Rajo Intan

Blogger, pemiliki Onestring Lab, menulis artikel terkait teknologi informasi dan pendidikan. Web Developer, berpengalaman lebih dari 20 tahun mengembangkan berbagai aplikasi dan sistem informasi. Kerjasama kontak di onestringlab@gmail.com atau https://forms.gle/xAGKkpi6B3BzJyzk7

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