Question

Program Instructions:

Write a C++ program that uses a random number generator to generate a two digit positive integer and allows the user to perform one or more of the following operations:

1. Double the number.
2. Reverse the digits of the number.
3. Raise the number to the power of 2, 3, or 4.
4. Sum the digits of the number.
5. If the number is a two digit number, then raise the first digit to the power of the second digit.
6. If the number is a three digit number and the last digit is less than or equal to 4, then raise the first two digits to the power of the last digit.

After performing an operation if the number is less than 10, add 10 to the number. Also, after each operation determine if the number is prime.

Each successive operation should be performed on the number generated by the last operation. Your program should not contain any global variables and each of these operations must be implemented by a separate function. Also, your program should be menu driven. (#include <string>)

Answer 1

//C++ program

#include<iostream>
#include<stdlib.h>
#include<time.h>
#include<math.h>
using namespace std;

int randomNumber(int min , int max){
   return min + rand()%(max-min+1);
}

int doubleNumber(int num){
   return num*2;
}
int reverseDigit(int num){
   int reverse=0;
   while(num >0){
       reverse*=10;
       reverse+=num%10;
       num/=10;
   }
   return reverse;
}

int raise(int num , int power){
   int value = 1;
   for(int i=1;i<=power;i++){
       value*=num;
   }
   return value;
}

int sumDigits(int num){
   int sum = 0;
   while(num >0){
       sum+=num%10;
       num/=10;
   }
   return sum;
}

int raisePower(int num){
   if(num<100 && num>9){
       return raise(num/10 , num%10);
   }
   if(num>99 && num<1000){
       if(num%10 <=4){
           return raise(num/10 , num%10);
       }
   }
}

bool isPrime(int num){
   if(num <= 1)return false;
   for(int i=2;i<=sqrt(num);i++){
       if(num%i == 0)return false;
   }
   return true;
}

void menu(){
   cout<<"\n1.Double the number\n2.Reverse Digits\n3.Raise the number to the power of 2, 3, or 4\n";
   cout<<"4.Sum the digits of the number.\n5.number operation\n6.Quit\n";
}

int main(){
   srand(time(NULL));
   int number,choice,power;
   cout<<"Generating 2 digits random number \n";
   number = randomNumber(10,99);
  
   do{
       menu();
       cout<<"Enter choice : ";
       cin>>choice;
      
       switch(choice){
           case 1:{
               number = doubleNumber(number);
               break;
           }
           case 2:{
               number = reverseDigit(number);
               break;
           }
           case 3:{
               cout<<"Enter value of power(either 2 ,3 or 4): ";
               cin>>power;
               number = raise(number , power);
               break;
           }
           case 4:{
               number = sumDigits(number);
               break;
           }
           case 5:{
               number = raisePower(number);
               break;
           }
           case 6:{
               cout<<"Thank You!\n";
               break;
           }
           default:{
               cout<<"Invalid choice\n";
               break;
           }
       }
      
       if(isPrime(number))
           cout<<number<<" is prime\n";
      
       else cout<<number<<" is not prime\n";
      
       if(number<10){
           cout<<"Number is "<<number<<" less than 10\n";
           number+=10;
       }
       cout<<"\nNumber is "<<number<<"\n";
      
   }while(choice!=6);

return 0;
}

//sample output