C program to convert Octal to Binary number system

Write a C program to read Octal number from user and convert to Binary number system. How to convert from Octal number system to Binary number system in C.

Example:
Input Octal number: (172)8
Output Binary number: (01111010)2

Required knowledge:

Basic C programming, For loop

Octal number system:

Octal number system is a base 8 number system. It uses 8 symbols to represent all its numbers i.e. 0 1 2 3 4 5 6 7

Binary number system:

Binary number system is a base 2 number system. It uses only two symbols i.e. 0 and 1 to represent all numbers.

Algorithm to convert Octal to Binary:

Algorithm to convert from Octal to Binary is simple. Separate each octal digit and write the binary equivalent of each octal digit.
Octal to Binary conversion

Octal to Binary conversion table:
Decimal Octal Binary
0 0 000
1 1 001
2 2 010
3 3 011
4 4 100
5 5 101
6 6 110
7 7 111

Algorithm Conversion from Octal to Binary
begin:
    read(OCTAL);
    OCTALVALUES[] ← 0, 1, 10, 11, 100, 101, 110, 111;
    BINARY ← 0; REM ← 0; PLACE ← 1;
    While(OCTAL !=0)
        begin:
            REMOCTAL % 10;
            BINARY ← (OCTALVALUES[REM] * PLACE) + BINARY;
            OCTALOCTAL / 10;
            PLACEPLACE * 1000;
        end;
    write('Binary =' BINARY);
end;

Program:

/**
 * C program to convert Octal number system to Binary number system
 */

#include <stdio.h>

int main()
{
    int OCTALVALUES[] = {0, 1, 10, 11, 100, 101, 110, 111};
    long long octal, tempOctal, binary, place;
    int rem;
    
    /*
     * Reads Octal number from user
     */
    printf("Enter any Octal number: ");
    scanf("%lld", &octal);
    tempOctal = octal;

    binary = 0;
    place = 1;
    
    /* 
     * Finds Binary of the octal number
     */
    while(tempOctal!=0)
    {
        rem = tempOctal % 10;
        binary = (OCTALVALUES[rem] * place) + binary;
        tempOctal /= 10;

        place *= 1000;
    }

    printf("\nOctal number = %lld\n", octal);
    printf("Binary number = %lld", binary);

    return 0;
} 
Output
Enter any Octal number: 1720

Octal number = 1720
Binary number = 1111010000

Happy coding ;)


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