To determine whether a number is prime or not, we have to divide the number successively by all numbers from 2 to one less than itself.
If remainder of any of these divisions is zero, the number is not a prime.
If no division yields a zero then the number is a prime number.
Program in C to Determine Whether a Number is Prime or Not
Steps:
- Declare integers num and i inside main()
- Prompt the message allow the input using printf() and scanf()
- Test whether a Number is prime or not using while() function.
Code:
#include <stdio.h>
int main()
{
int num, i;
printf("Enter a number");
scanf ("%d",&num);
i=2;
while (i<=num-1)
{
if (num%i==0)
{
printf("Not a prime number\n");
break;
}
i++;
}
if (i==num)
printf("Prime number\n");
return 0;
}
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