Simple C Program to Convert Binary to Decimal Number

Using this program user can  enter binary number and convert it into decimal 

Binary number system:-It is base 2 number which uses the digits from 0 and 1.

 

Decimal number system:-It is base 10 number which uses the digits from 0 to 9

   For example we want to convert binary number 0010100 to decimal:

Step1:  0 * 1  = 0

Step2:  0 * 2  = 0

Step3:  1 * 4  = 4

Step4:  0 * 8  = 0

Step5:  1 * 16 = 16

Its decimal value: 0 + 0 + 4 + 0 + 16 = 20

 

Program:

 

 

//C Program to enter binary number and find out its decimal by www.SlashMyCode.com

#include <stdio.h>

#include <conio.h>

void main()

{

    int num,bnum,dec=0,base=1,rem;

    printf("Enter Binary Number(1s and 0s)\n");

    scanf("%d",&num);

    bnum=num;

    while(num>0)

    {

        rem=num%10;

        dec=dec+rem*base;

        num=num/10;

        base=base*2;

    }

    printf("binary num=%d\n",bnum);

    printf("Decimal Number=%d",dec);

     //C Program to enter binary number and find out its decimal by www.SlashMyCode.com

    getch();

}

Output:

 

Algorithm:

1. Start
2. Define num,bnum,dec=0,base=1,rem
3. Accept value of num
4. bnum=num
5. If num>0 go to Step 6 else go to Step 10
6. Calculate rem=num%10
7.                 dec=dec+rem*base
8.                 num=num/10
9.                 base=base*2
10. Go to Step 5 again
11. Print Binary Number
12. Print Decimal Number 
13. Stop