How To Check Prime Number In C
In this tutorial, we are going to see how to check prime number in C. A prime number is a number that is only divisible by 1 or by itself. For example, 17 is only divisible by 17 or by itself. Other primes number 2, 3, 5, 7, 11, 13, 17…
Note: 0 and 1 are not prime numbers. 2 is the only even prime number.
How To Check Prime Number In C
#include <stdio.h>
int main()
{
int p = 0, i, nbr;
printf(" Enter a number: ");
scanf("%d", &nbr);
for(i=1; i<=nbr; i++)
{
if(nbr%i==0)
{
p++;
}
}
if(p==2)
{
printf(" %d is a prime number.",nbr);
}
else
{
printf(" %d is not a prime number.",nbr);
}
}
Output:
Enter a number: 2 2 is a prime number.
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