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Check a number is prime or not
Programming Logics 06 Jul,2016 0

The simplest primality test is trial division: Given an input number n, check whether any prime integer m from 2 to n/2 evenly divides n (the division leaves no remainder).

int main(){    
int n, i, flag = 0;
printf("Enter a positive integer: ");

for(i=2; i<=n/2; ++i)
// condition for nonprime number

if (flag==0)
printf("%d is a prime number.",n);
printf("%d is not a prime number.",n);

return 0;

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