# 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

Categories C