# WAP in C to Check whether a number is prime or not

The Program in C to Check whether a number is prime or not is given below:

``````#include <stdio.h>

int main() {
int num, i, flag = 0;

printf("Enter a positive integer: ");
scanf("%d", &num);

for(i = 2; i <= num/2; ++i) {
if(num%i == 0) {
flag = 1;
break;
}
}

if (flag == 1)
printf("%d is not a prime number.", num);
else
printf("%d is a prime number.", num);

return 0;
}
``````

## Output:

Enter a positive integer: 3
3 is a prime number.

## Pro-Tips💡

This program prompts the user to enter a positive integer, reads the value entered by the user and stores it in the variable “num”.

Then, it uses a for loop to check if the number is divisible by any integer between 2 and num/2.

If the number is divisible by any of the integers within this range, it sets the flag variable to 1, otherwise the flag remains 0.

After the loop, if flag is equal to 1, the program prints that the number is not prime, otherwise it prints that the number is prime.

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