C Program to Convert Binary to Decimal

In this tutorial, i am going to show you how to convert binary number to decimal number in c program with the help of for loop, while loop, function, and recursion.

Algorithm and Programs to Convert Binary to Decimal in C

  • Algorithm to Convert Binary to Decimal
  • C Program to Convert Binary to Decimal using While Loop
  • C Program to Convert Binary to Decimal using For Loop
  • C Program to Convert Binary to Decimal using Function
  • C Program to Convert Binary to Decimal using Recursion

Algorithm to Convert Binary to Decimal

Just follow the below given algorithm to write a program to convert binary number to decimal number; as follows:

  • Step 1: Start
  • Step 2: Read the binary number from the user, say ‘n’
  • Step 3: Initialize the decimal number, d=0
  • Step 4: Initialize i=0
  • Step 5: Repeat while n != 0:
    • Step 5.1: Extract the last digit by: remainder = n % 10
    • Step 5.2: n = n/10
    • Step 5.3: d = d + (remainder * 2i)
    • Step 5.4: Increment i by 1
  • Step 6: Display the decimal number, d
  • Step 7: Stop

C Program to Convert Binary to Decimal using While Loop

#include <stdio.h>
int main()
{
    int binary, decimal = 0, base = 1, remainder;
    
    printf("Enter the Binary Number = ");
    scanf("%d", &binary);
    int temp = binary;
    while(temp > 0)
    {
        remainder = temp % 10;
        decimal = decimal + remainder * base;
        temp = temp / 10;
        base = base * 2;
    }
    printf("The Binary Value  = %d\n", binary);
    printf("The Decimal Value = %d\n", decimal);
    return 0;
}

The result of the above c program; as follows:

Enter the Binary Number = 1101
The Binary Value  = 1101
The Decimal Value = 13

C Program to Convert Binary to Decimal using For Loop

#include <stdio.h>
int main()
{
    int binary, decimal = 0, base = 1, remainder, temp;
    
    printf("Enter the Binary Number = ");
    scanf("%d", &binary);
   for(temp = binary; temp > 0; temp = temp / 10)
    {
        remainder = temp % 10;
        decimal = decimal + remainder * base;
        base = base * 2;
    }
    printf("The Binary Value  = %d\n", binary);
    printf("The Decimal Value = %d\n", decimal); 
    return 0;
}

The result of the above c program; as follows:

Enter the Binary Number = 110101
The Binary Value  = 110101
The Decimal Value = 53

C Program to Convert Binary to Decimal using Function

#include <stdio.h>
#include <math.h>
int binaryToDecimal(int binary)
{
    int decimal = 0, i = 0, remainder;
    while(binary != 0)
    {
         remainder = binary % 10;
         decimal = decimal + (remainder * pow(2, i));
         binary = binary / 10;
         ++i;
    }
    return decimal;
}
int main()
{
    int binary, decimal;
    
    printf("Enter the Binary Number = ");
    scanf("%d", &binary);
    decimal = binaryToDecimal(binary);
    printf("The Binary Value  = %d\n", binary);
    printf("The Decimal Value = %d\n", decimal); 
    return 0;
}

The result of the above c program; as follows:

Enter the Binary Number = 010101
The Binary Value  = 10101
The Decimal Value = 21

C Program to Convert Binary to Decimal using Recursion

#include<stdio.h>
int BinaryToDecimal(int n)
{
    if(n==0)
        return 0;
    else
        return (n% 10 + 2* BinaryToDecimal(n / 10));
}
int main()
{
    int n;
    printf("Enter the Binary Value:");
    scanf("%d",&n);
    printf("Decimal Value of Binary number is: %d",BinaryToDecimal(n));
}

The result of the above c program; as follows:

Enter the Binary Value:1101
Decimal Value of Binary number is: 13

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