C Exercises: Convert binary number to octal

C For Loop: Exercise-53 with Solution

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

Pictorial Presentation:

Sample Solution:

C Code:

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

void main()
{       int n1, n,p=1;
	int dec=0,i=1,j,d;
        int ocno=0,dn;


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

	printf("Input a binary number :");
	scanf("%d",&n);
	n1=n;
	for (j=n;j>0;j=j/10)
	{  
          d = j % 10;
            if(i==1)
                  p=p*1;
            else
                 p=p*2;

	   dec=dec+(d*p);
	   i++;
	}
 
/*--------------------------------------------*/
     dn=dec;
     i=1;

      for(j=dec;j>0;j=j/8)
       {
        ocno=ocno+(j % 8)*i;
        i=i*10;
        n=n/8;
       }
   
        printf("\nThe Binary Number : %d\nThe equivalent Octal  Number : %d \n\n",n1,ocno);
}

Sample Output:

Convert Binary to Octal:                                                                                      
 -------------------------                                                                                    
Input a binary number :1001                                                                                   
                                                                                                              
The Binary Number : 1001                                                                                      
The equivalent Octal  Number : 11 

Flowchart :

C Programming Code Editor:

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