This C Program converts a binary number to an equivalent octal number.

## Example: Program to convert Binary to Octal

In this program, user is asked to enter the binary number and the program then converts that binary number to the octal number by calling a user defined function. To understand this program, you should be familiar with the following C programming concepts:

#include <stdio.h> #include <math.h> //This function converts binary number to octal number 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: 111001 Equivalent octal value: 71

In this program, we are converting the entered binary number to decimal number first and then we are converting that decimal number to the octal number.

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