Write a program to have the computer guess at a number between 1 and 20. This program has you, the user choose a number between 1 and 20. Then I, the computer will try to my best to guess the number. Is it a 18? (y/n) n Higher or Lower (h/l) l Is it a 5?(y/n) n Higher or Lower (h/l) h Is it a 10? (y/n) y I got tour number of 10 in 3 guesses.

This question is answered using C++ programming language.

#include<iostream>

#include <cstdlib>

#include <ctime>

using namespace std;

int main(){

   int num, computerguess;

   char response, hl;

   cout<<"Choose your number: ";

   cin>>num;

   srand((unsigned) time(0));

   int high = 20;    int low = 1;    int guess = 0;

   computerguess = low + rand() % high;

   cout<<"Is it "<<computerguess<<" ?y/n: ";

   cin>>response;

   while(response == 'n'){

       cout<<"Higher or Lower? h/l: ";

       cin>>hl;

       if(hl == 'h'){            low = computerguess+1; }

       else{   high = computerguess-1; }

       guess++;

       computerguess = low + rand() % high;

       cout<<"Is it "<<computerguess<<" ?y/n: ";

   cin>>response;

   }

   cout<<"I got your number of "<<num<<" in "<<guess+1<<" guesses.";

   return 0;

}

Explanation:

This declares num (user input) and computerguess as integer

   int num, computerguess;

This declares response (which could be yes (y) or no (n) and hl (which represents high or low) as char

   char response, hl;

This prompts user for input

   cout<<"Choose your number: ";

This gets user input

   cin>>num;

This allows the computer be able to generate different random numbers at different intervals

   srand((unsigned) time(0));

This declares and initializes the range (high and low) to 20 and 1 respectively. Also, the initial number of guess is declared and initialized to 0

   int high = 20;    int low = 1;    int guess = 0;

Here, the computer take a guess

   computerguess = low + rand() % high;

This asks if the computer guess is right

   cout<<"Is it "<<computerguess<<" ?y/n: ";

This gets user response (y or n)

   cin>>response;

The following iteration is repeated until the computer guess is right

   while(response == 'n'){

This asks if computer guess is high or low

       cout<<"Higher or Lower? h/l: ";

This gets user response (h or l)

       cin>>hl;

If the response is higher, this line gets the lower interval of the range

       if(hl == 'h'){            low = computerguess+1; }

If the response is lower, this line gets the upper interval of the range

       else{   high = computerguess-1; }

This increments the number of guess by 1

       guess++;

Here, the computer take a guess

   computerguess = low + rand() % high;

This asks if the computer guess is right

   cout<<"Is it "<<computerguess<<" ?y/n: ";

This gets user response (y or n)

   cin>>response;    }

This prints the statistics of the guess

   cout<<"I got your number of "<<num<<" in "<<guess+1<<" guesses.";

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