Write a program to check if a number is prime or not.

 //program to check if a number is prime or not.

//number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7)
// 0 and 1 are not prime numbers.
// 2 is the only even prime number.

#include<stdio.h>

int main()

{
    int n , a;
    
    printf("enter any number\n");
    
    scanf("%d", &n);
    
    for(int i=1; i<=n; i++){ /*for loop is executed until the i value is equal to i*/
if(i%n==0){
a++; /* a will get increment if  i%n=0 */
}
}
if(a==2){
printf("n is a prime number");
}
    
    else{
   
    printf("n is not a prime number");
}
    
    return 0;
}

output :

enter any number
5
n is not a prime number
--------------------------------
Process exited after 8.33 seconds with return value 0
Press any key to continue . .



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