Question

input the number and find out the number is prime or not ​

Answer 1

Explanation:

include <stdio.h>

int main()

{

int n, i, flag = 0;

printf("Enter a positive integer: ");

scanf("%d", &n);

for(i = 2; i <= n/2; ++i)

{

// condition for nonprime number

if(n%i == 0)

{

flag = 1;

break;

}

}

if (n == 1)

{

printf("1 is neither a prime nor a composite number.");

}

else

{

if (flag == 0)

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

else

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

}

return 0;