C Exercises: Convert an octal number into binary

C For Loop: Exercise-54 with Solution

Write a program in C to convert an octal number into binary.

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>
#include <math.h>

void main()
{


     long int n1, n5,p=1;
     long int dec=0,i=1,j,d;
     long int binno=0;


     printf("\n\nConvert Octal to Binary:\n ");
     printf("-------------------------\n");

	printf("Input an octal number (using digit 0 - 7) :");
	scanf("%ld",&n1);
	n5=n1;



	for (j=n1;j>0;j=j/10)
	{  
          d = j % 10;
            if(i==1)
                  p=p*1;
            else
                 p=p*8;

	   dec=dec+(d*p);
	   i++;
	}

/*------------------------------------------------------------------------------*/
     i=1;

      for(j=dec;j>0;j=j/2)
       {
        binno=binno+(dec % 2)*i;
        i=i*10;
        dec=dec/2;
       }
     
        printf("\nThe Octal Number : %ld\nThe equivalent Binary  Number : %ld \n\n",n5,binno);

}

Sample Output:

Convert Octal to Binary:                                                                                      
 -------------------------                                                                                    
Input an octal number (using digit 0 - 7) :57                                                                 
                                                                                                              
The Octal Number : 57                                                                                         
The equivalent Binary  Number : 101111 

Flowchart:

C Programming Code Editor:

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