C

prime check in c

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 program in c

bool isPrime(int x = 0)
{
    /* Without extra 'count' variable */
    //! corner case: 0 and 1 aren't prime numbers
    if (x == 0 || x == 1)
        return 0;

    for (int i = 2; i <= x / 2; i++)
    {
        if (x > 2 && x % i == 0)
            return 0;
    }

    return 1;
}

Prime Number Check Program in C

#include <stdio.h> 

main() {
  int n, i, c = 0;
  printf("Enter any number n:");
  scanf("%d", &n);

  //logic
  for (i = 1; i <= n; i++) {
      if (n % i == 0) {
         c++;
      }
  }

  if (c == 2) {
  printf("n is a Prime number");
  }
  else {
  printf("n is not a Prime number");
  }
  return 0;    
}
Program Output:

prime number in c

#include<stdio.h>
void main(){
    int num, i;
    int cp = 1;
    printf("Enter a number = ");
    scanf("%d",&num);

    if(num > 0){
        for(i = 2; i < num; i++){
            if(num % i == 0){
                cp = 0;
            }
        }
        if(cp == 1){
            printf("%d is a prime number.", num);
        }
        else{
            printf("%d isn't a prime number.", num);
        }
    }
}

check prime number or not c

#include <stdio.h>

int main() {

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


  if (n == 0 || n == 1)
    flag = 1;

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


    if (n % i == 0) {
      flag = 1;
      break;
    }
  }

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

  return 0;
}

prime number c program

int isPrime(int n) {
  for (int i = 2; i < n; i++) if (n % i == 0) return 0; 
  return 1;
}

prime number in c

#include<stdio.h>  
int main(){    
int n,i,m=0,flag=0;    
printf("Enter the number to check prime:");    
scanf("%d",&n);    
m=n/2;    
for(i=2;i<=m;i++)    
{    
if(n%i==0)    
{    
printf("Number is not prime");    
flag=1;    
break;    
}    
}    
if(flag==0)    
printf("Number is prime");     
return 0;  
 }    

check whether a number is prime or not in c

int n=7,i,flag=0;
	for(i=2;i<n/2;i++){
		if(n%i==0){
			flag=1;
			break;
		}
	}

	if(flag==0){
	printf("Prime number");

	}else{
		printf("not prime number");
	}