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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int main()
  5. {
  6.     char hex[17], bin[65] = "";
  7.     int i = 0;
  8.  
  9.     /* Input hexadecimal number from user */
  10.     printf("Enter any hexadecimal number: ");
  11.     gets(hex);
  12.  
  13.     /* Extract first digit and find binary of each hex digit */
  14.     for(i=0; hex[i]!='\0'; i++)
  15.     {
  16.         switch(hex[i])
  17.         {
  18.             case '0':
  19.                 strcat(bin, "0000");
  20.                 break;
  21.             case '1':
  22.                 strcat(bin, "0001");
  23.                 break;
  24.             case '2':
  25.                 strcat(bin, "0010");
  26.                 break;
  27.             case '3':
  28.                 strcat(bin, "0011");
  29.                 break;
  30.             case '4':
  31.                 strcat(bin, "0100");
  32.                 break;
  33.             case '5':
  34.                 strcat(bin, "0101");
  35.                 break;
  36.             case '6':
  37.                 strcat(bin, "0110");
  38.                 break;
  39.             case '7':
  40.                 strcat(bin, "0111");
  41.                 break;
  42.             case '8':
  43.                 strcat(bin, "1000");
  44.                 break;
  45.             case '9':
  46.                 strcat(bin, "1001");
  47.                 break;
  48.             case 'a':
  49.             case 'A':
  50.                 strcat(bin, "1010");
  51.                 break;
  52.             case 'b':
  53.             case 'B':
  54.                 strcat(bin, "1011");
  55.                 break;
  56.             case 'c':
  57.             case 'C':
  58.                 strcat(bin, "1100");
  59.                 break;
  60.             case 'd':
  61.             case 'D':
  62.                 strcat(bin, "1101");
  63.                 break;
  64.             case 'e':
  65.             case 'E':
  66.                 strcat(bin, "1110");
  67.                 break;
  68.             case 'f':
  69.             case 'F':
  70.                 strcat(bin, "1111");
  71.                 break;
  72.             default:
  73.                 printf("Invalid hexadecimal input.");
  74.         }
  75.     }
  76.  
  77.     printf("Hexademial number = %s\n", hex);
  78.     printf("Binary number = %s", bin);
  79.  
  80.     return 0;
  81. }
Success #stdin #stdout 0s 4552KB
comments (?)
stdin
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4a
stdout
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Enter any hexadecimal number: Hexademial number = 4a
Binary number = 01001010
https://ideone.com/pdt72d
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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