Answer to Question #1497 in C++ for idaira

Question

Write a program that let the user to enter any positive number and the program will tell the user if the number is a prime number or not a prime number. Allow the user to continue the process until the user enters a sentinel. For this program, you are required to use an alphabet as the sentinel. Use do-while loop for this program.

Answer 1

#include <stdbool.h>
#include <stdio.h>

using namespace std;

bool is_simple(int count){
    for(int i =2; i < count; i++){
        if(count % i == 0)
            return false;
    }
    return true;
}

int main(int argc, char * argv[]){

    char * str;

    do{
        int count;

        str = new char[30];
        cin >> str;

        count = atoi(str);

        if(is_simple(count)){
            printf("Is simple.
");
        }else{
            printf("Is not simple!
");
        }

    }while(!isalpha((int)(*str)));


    return 0;
}