In this tutorial, we will explain a simple program which will convert the number from binary to the decimal number system. We have not used any validation in number input as this program is designed for the beginners for learning purpose.

You can modify this program to validate the number entered by the user during the program execution time, then the user can only enter the binary number in the combination of (0, 1).

Below is the algorithm of number conversion from binary to decimal.

- Accept Number from User as 0,1
- Divide number by 10 and store remainder in variable temp
- Again divide the original number by 10.
- Then calculate the sum of number to get the decimal.

Copy the below c program and execute it with c compiler to see the output of the program and also start converting the number system from binary number to decimal number.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | #include<stdio.h> #include<conio.h> #include<math.h> void bin_dec(long int num) // Function Definition { long int temp,sum=0,power=0; while(num>0) { temp = num%10; num = num/10; sum = sum + temp * pow(2,power); power++; } printf("Decimal number : %d",sum); } //------------------------------------- void main() { long int num; clrscr(); printf("Enter the Binary number (0 and 1): "); scanf("%ld",&num); bin_dec(num); getch(); } |

#First try

Enter the Binary number (0 and 1) : 101

Decimal number : 5

#Second try

Enter the Binary number (0 and 1): 111011

Decimal number : 59

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