In this post, we will learn how to convert binary to decimal using C Programming language.
Here in this program, we take a binary number as input and convert it into a decimal number using a user-defined function.
So, without further ado, let’s begin this tutorial.
C Program To Convert Binary To Decimal
// C Program To Convert Binary To Decimal
#include <stdio.h>
#include <math.h>
int binarytodecimal(long num){
int rem, temp = 0, decimal = 0;
while (num != 0){
rem = num % 10;
num = num / 10;
decimal = decimal + rem * pow(2, temp);
temp++;
}
return decimal;
}
int main(){
long num;
// Asking for Input
printf("Enter a number: ");
scanf("%ld", &num);
printf("Equivalent decimal number is: %d", binarytodecimal(num));
return 0;
}
Output
Enter a number: 10010
Equivalent decimal number is: 18
How Does This Program Work ?
int binarytodecimal(long num){
int rem, temp = 0, decimal = 0;
while (num != 0){
rem = num % 10;
num = num / 10;
decimal = decimal + rem * pow(2, temp);
temp++;
}
return decimal;
}
In this program, we have defined a custom function named binarytodecimal which will convert the binary number into decimal number.
Suppose the user enters 10010, then we get the following result:
| num != 0 | rem = n % 10 | num = num / 10 | temp | decimal += rem * pow(2, temp) |
|---|---|---|---|---|
| 10010 != 0 | 10010 % 10 = 0 | 10010 / 10 = 1001 | 0 | 0 + 0 = 0 |
| 1001 != 0 | 1001 % 10 = 1 | 1001 / 10 = 100 | 1 | 0 + 2 = 2 |
| 100 != 0 | 100 % 10 = 0 | 100 / 10 =10 | 2 | 2 + 0 = 2 |
| 10 != 0 | 10 % 10 = 0 | 10 / 10 =1 | 3 | 2 + 0 = 2 |
| 1 != 0 | 1 / 10 = 1 | 1 / 10 | 4 | 2 + 16 = 18 |
| 0 != 0 | – | – | – | – |
Hence, we get (10010)2 = (18)10
printf("Equivalent decimal number is: %d", binarytodecimal(num));
We call our custom function binarytodecimal in the main() function which will display the result to the user.
Conclusion
I hope after going through this post, you understand how to convert binary to decimal using C Programming language.
If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to help you.
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