The program determines prime numbers

The progam determinet prime numbers

C language

  

Program Contents:

 #include <stdio.h>

int main(void) {
    int i, num, flag;

    printf(" \n");
    printf("       DETERMINING THE NUMBERS PRIMA        \n");
    printf("____________________________________________\n");
    printf("Insert numbers: \n");
    scanf("%d", &num);

    if(num < 2) {

        / / If the number is less than 2, 
       / / Set flag to false (not prime) 


        flag = 0;
    } else if(num > 3) {

        //If the number is more than 3, 
       / / Do loop to divide these numbers 
      


        i = 2;
        do {
            

             / / Do operations modulo 
           / / Operation result 0 (no trace) 


            flag = num % i++;

        } while((i < (num / 2)) && flag);

        / / Loop as long as i is less than half the number 
      / / And the flag is true 

    }
    

    //Show results 

    
    if(flag) {
        printf("Prima");
    } else {
        printf("No Prima");
    }

    return 0;
}