How to check prime numbers in C ?

Question

Check prime numbers using functions in C.

Answer 1

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

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

// condition for non-prime
if (n % i == 0) {
flag = 1;
break;
}
}

if (n == 1) {
printf("1 is neither prime nor composite.");
}
else {
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
}

return 0;
}
check this for more information https://www.programiz.com/c-programming/examples/prime-number

Answer 2

Look at this code bro !

https://code.sololearn.com/cH0czjmuqCiN/?ref=app