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C program to input binary number from user and convert binary number to decimal number system.

C program to input binary number from user and convert binary number to decimal number system.
How to convert from binary number system to decimal number system in C programming.

Binary number system

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

    Input binary number from user. Store it in a variable say binary.
    Find last digit from binary by performing modulo division. Which is lastDigit = binary % 10.
    If lastDigit is 1. Then add power of 2 to the decimal result. Which is decimal += pow(2, N), where N is the position from right.

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

#define BASE 2

int main()
{
    long long binary, decimal=0, tempBinary;
    int N=0;

    printf("Enter any binary number: ");
    scanf("%lld", &binary);

    tempBinary = binary;

    while(tempBinary!=0)
    {
        /* If current binary digit is 1 */
        if(tempBinary % 10 == 1)
        {
            decimal += pow(BASE, N);
        }

        N++;
        tempBinary /= 10;
    }

    printf("Binary number = %lld\n", binary);
    printf("Decimal number= %lld", decimal);

    return 0;
}

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