1:  

   2: /*

   3:  * A converter for Decimal to Binary Quaternary or Octal

   4:  */

   5:  

   6: #include <stdio.h> 

   7:  

   8: void printbin(int, int); 

   9: void printQuater(int,int); 

  10: void printOtc(int,int); 

  11:  

  12: int main(void) 

  13: { 

  14:         int x; 

  15:         printf("Input Number: "); 

  16:         scanf("%d", &x); 

  17:  

  18:     //Binary 

  19:         printf("it's binary form: "); 

  20:         printbin(x, sizeof(int)*8); 

  21:         putchar('\n'); 

  22:  

  23:     //Quaternary

  24:     printf("it's Quaternary form: "); 

  25:     printQuater(x, (sizeof(int)*8)); 

  26:     putchar('\n'); 

  27:  

  28:     //OTC 

  29:     printf("it's Otc form: "); 

  30:     printOtc(x, (sizeof(int)*8+1)); 

  31:     putchar('\n'); 

  32:  

  33:     return 0;

  34: } 

  35:  

  36: //Binary

  37: void printbin(int x, int n) 

  38: { 

  39:         if(n>0) 

  40:         { 

  41:                 putchar('0'+((unsigned) ( x &amp; (1 << (n-1)))  >> (n-1))); 

  42:                 printbin(x,n-1); 

  43:         } 

  44: } 

  45:  

  46:  

  47: // Quaternary

  48: void printQuater(int x,int n) 

  49: { 

  50:     if(n>0) 

  51:     { 

  52:         putchar('0'+ ((unsigned)( x &amp; ( 3 << (n-2))) >> (n-2) ) ); 

  53:         printQuater(x,n-2); 

  54:     } 

  55: } 

  56:  

  57: //Octal

  58: void printOtc(int x, int n) 

  59: { 

  60:     if(n>0) 

  61:     { 

  62:         putchar('0'+ ((unsigned)( x &amp; ( 7 << (n-3))) >> (n-3) ) ); 

  63:         printOtc(x,n-3); 

  64:     } 

  65:  

  66: }