Program will not generate random numbers
 

I am having troubles getting this program to generate random numbers. Right now i have it set up to only generate 1 and 19. I do not know how to generate random numbers. :confused::?::twisted::eek:

thank you if anyone can help my dumbass.

// Exercise 12.16: MultiplicationTeacher.cpp

// This game asks the user to enter the product of two

// randomly generated numbers in the range 0-9.

#include <iostream> // required to perform C++ stream I/O

#include <ctime>    // contains prototype for function time



// contains function prototypes for functions srand and rand

#include <cstdlib>



using namespace std; // for accessing C++ Standard Library members



// function prototypes

int generateQuestion();

void generateOutput();



// function main begins program execution

int main()

{

   // randomize random number generator using current time

   srand( time( 0 ) ); 



   // define variables

   //int userAnswer = 0; // stores the user's answer

   int correctAnswer;  // stores the correct answer

   int a;

   int lowest=1, highest=19;

   int range=(highest-lowest)+1;

   int input;

   int times = lowest * highest;



   for(int index=0; index<1; index++){



   a = lowest+int(range*rand()/(RAND_MAX + 1.0));



   cout << "How much is" << lowest <<""<< "times" <<""<< highest << "(-1 to end)?" << endl;

   cin >> input;



   while(input = times)

   cout << "How much is" << lowest <<""<< "times" <<""<< highest << "(-1 to end)?" << endl;

   cin >> input;

   }



   return 0; // indicates successful termination

Re: Program will not generate random numbers
 

change a = lowest+int(range*rand()/(RAND_MAX + 1.0)); to
a = (rand() % highest) + lowest;
This takes the random value, divides it by highest and keeps the remainder (0-18) then adds 1 (0-19)

Now you're a smartass :mrgreen:

Re: Program will not generate random numbers
 

Really? . . . http://eternallyconfuzzled.com/arts/jsw_art_rand.aspx

Either way works, and some would recommend the OP's way over yours (myself included).

If you want it to generate numbers outside of 1-19 or something, change these variables.

   int lowest=1, highest=19;

What exactly do you want?

Re: Program will not generate random numbers
 

Thanks for the link. Interesting.... I'm convinced

I also noticed an error in my solution. So go ahead and use your original equation. :o