Question

write a c program to check
whether the given
given number is prime or not

​

Answer 1

Check prime number by C Language

Output:

Enter number to check prime number: 7

7 is a prime number.

Explanation:

//set header file

#include<stdio.h>

//set main function

int main()

{//set integer type variables

 int num, a;

 //print message for input

 printf("Enter number to check prime number: ");

 //get input from the user

 scanf("%d", &num);

 //set for loop

 for (a = 2; a <= num/2; a++)

 {//check condition for not a prime number

   if (num%a == 0)

   { //print message if not a prime number

     printf("%d is not a prime number.\n", num);

     //break the loop

     break;

   }

 }

 //check condition for a prime number

 if (a == num/2 + 1)

   //print message if prime number

   printf("%d is a prime number.\n", num);

 return 0;

}

Following are the description of the program:

• Set required header file and define main method, inside the main method.
• Set two integer data type variables that is 'num' and 'a'.
• Print message to input and get input from the user in the variable 'num'.
• Set the for loop and inside the loop set if conditional statement to check that the given number is not a prime then, print message and break loop.
• Finally, set if conditional statement to check that the number is prime and print message.

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