Question

In C:Write a program that can determine whether a user input is a binary number or not. (1, 2, 3, 8, 13) Write a program that accomplishes all of the following:

Greets the user and informs them that the program will determine whether an input from the user is a valid binary number or not (e.g., consisting of only 0’s and/or 1’s).

Accept an integer input from the user. Assume that the user provides a valid numeric input that will fit in the standard int type. However, check to make sure the input was a positive number - for our purposes, any negative integer input is not a binary number.

Use a loop to check all of the digits of the given input to determine that they are either 0 or 1 (Hint: You may want to use the modulus and division operators to process the digits one-by-one).

If all digits were either 0 or 1, print a message to the user stating that the input was a valid binary number. Otherwise, print a message stating that the input was not a valid binary number.

Test your program thoroughly. Make sure to at least the following inputs and verify the results:

0: binary

1: binary

01: binary

21001: not binary

-1011: not binary

123: not binary

10101: binary

Answer 1

In the following C program, we ask the user for an integer num, then check if its negative or not. If it is then we set a flag to 1. Then using a while loop that runs until the num is 0, inside the loop we retrieve the unit place digit of num using mod operation. If the digit is anything other than a 0 or a 1, it sets the flag as well. Then we divide the num by 10 for the next unit place digit.

Finally, we check if the flag is 1 or not, if it is then number is not binary otherwise it is.

CODE:

#include<stdio.h>

int main()
{
   int num;
   int flag=0;
   int rem;
   printf("***Check weather the input is binary or not***");
   printf("\nEnter the number: ");
   scanf("%d", &num);  
   if(num < 0 )   //if negative
       flag =1;   //set the flag
   while(num!=0)   //loop until num is 0
   {
       rem = num % 10;   //reteieve the unit place digit
       if(rem != 0 && rem != 1)   //check if not binary
           flag = 1;   //set the flag
       num = num/10;   //divide num by 10
   }
  
   if(flag == 1)   //if flag was set
       printf("Not binary");
   else   //otherwise
       printf("binary");
}

OUTPUT: