write easies code for me : Write a program in C to find if a number is prime or not.
Question
write easies code for me : Write a program in C to find if a number is prime or not.
Solution
Sure, here is a simple program to check if a number is prime:
#include <stdio.h>
int main() {
int num, i, isPrime = 1;
printf("Enter a number: ");
scanf("%d", &num);
if (num <= 1) {
isPrime = 0;
} else {
for (i = 2; i <= num / 2; ++i) {
if (num % i == 0) {
isPrime = 0;
break;
}
}
}
if (isPrime)
printf("%d is a prime number.\n", num);
else
printf("%d is not a prime number.\n", num);
return 0;
}
This program prompts the user to enter a number, then checks if the number is prime by testing divisibility from 2 up to half of the number. If the number is divisible by any of these, it is not prime.
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