Write a C Program to Convert Binary to Octal Number System

Write a C Program to Convert Binary to Octal Number System

 #include <stdio.h>
 #include<math.h>
 int binaryToOctal(long binarynum)
 {
    int octalnum = 0, decimalnum = 0, i = 0;



    /* This while loop converts binary number "binarynum" to the
     * decimal number "decimalnum"
     */
    while(binarynum != 0)
    {
        decimalnum = decimalnum + (binarynum%10) * pow(2,i);
        i++;
        binarynum = binarynum / 10;
    }

    //i is re-initialized
    i = 1;

    /* This loop converts the decimal number "decimalnum" to the octal
     * number "octalnum"
     */
    while (decimalnum != 0)
    {
        octalnum = octalnum + (decimalnum % 8) * i;
        decimalnum = decimalnum / 8;
        i = i * 10;
    }



    //Returning the octal number that we got from binary number
    return octalnum;
 }
 int main()
{
    long binarynum;

    printf("Enter a binary number: ");
    scanf("%ld", &binarynum);

    // calling the function here
    printf("Equivalent octal value: %d", binaryToOctal(binarynum));

    return 0;
 }
          

Output:

 Enter a binary number: 0101
 Equivalent octal value: 5
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