prime chec kin c
snippet in c

prime chec kin c

user8903

int isPrime(long long number) {

	if (number == 0 || number == 1 || (number % 2 == 0 && number > 2)) {
		return 0;
	}

	else {
		for (long long i=3; i <= (long long)sqrt(number)+1; i++) {
			if (number % i == 0) {
				return 0;
			}
		}
		return 1;
	}
}

prime number in c

user7035

// C program to check if a 
// number is prime 
  
#include <stdio.h> 
#include<math.h> 
int main() 
{ 
    int n, i, flag = 1; 
  
    // Ask user for input 
    printf("Enter a number: \n"); 
  
    // Store input number in a variable 
    scanf("%d", &n); 
  
    // Iterate from 2 to n/2 
    for (i = 2; i <= sqrt(n); i++) { 
  
        // If n is divisible by any number between 
        // 2 and n/2, it is not prime 
        if (n % i == 0) { 
            flag = 0; 
            break; 
        } 
    } 
  
    if(n<=1) 
    flag=0; 
    else if(n==2) 
    flag=1;  
  
    if (flag == 1) { 
        printf("%d is a prime number", n); 
    } 
    else { 
        printf("%d is not a prime number", n); 
    } 
  
    return 0; 
} 

prime number c

user7762

#include <stdio.h>
int main()
{
   int i, num, p = 0;
   printf("Please enter a number: \n");
   scanf("%d", &num);
   for(i=1; i<=num; i++)
   {
      if(num%i==0)
      {
         p++;
      }
   }
   if(p==2)
   {
      printf("Entered number is %d "\
             "and it is a prime number.",num);
   }
   else
   {
      printf("Entered number is %d "\
             "and it is not a prime number.",num);
   }
}