In this tutorial, we will write a program to check for the binary number in C.
What is a Binary Number?
A binary number is a number expressed in the base-2 numeral system that is the number that contains 2 symbols to represent all the numbers. The symbols are 0 and 1.
For example: 101011, 110011110, 10001111 are binary numbers.
C Program to check whether a Number is Binary or Not
We have used the while loop to iterate through the entered number in the program below. The program takes the input of a number from the user.
With each iteration, there is an if condition to check for 1 and 0 in the digit, If it is not 1 or 0 then it is not a binary number.
int i, number;
printf("Enter the Number: ");
int temp = number;
while (number > 0)
i = number % 10;
if (i != 0 && i != 1)
printf("%d is not a binary number", temp);
number /= 10;
if (number == 0)
printf("%d is a binary number", temp);
Enter the Number: 1101
1101 is a binary number
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