C++ arrays and random numbers

[kisvirag21]

I need to write a program that generates 10 problems, in which 2 randomly genorated numbers are chosen to multiply together, and the user has to input the correct answer for each program, and i have store the answers, and check to see if they are correct. I could just use a little help in understanding how to write the array code, and how to recall the stored numbers. I understand it starts storeing with 0 and goes up. Any help would be greatly appreciated

*generate the 10 problems.
*Use the function rand() to generate random digits from 0 through 9.
*I need to use 4 arrays to do this. the first 2 arrays for the numbers multiplyed, and the 3rd for the student answer, and fourth holds correct answers to do check with.

thanks again!

[iamthwee]

give us sum code then give us sum quesitons... I'm not gonna do ur homework again for you.

[SpS]

Random Number Tutorial

[kisvirag21]

Hey guys this is what i got, and it works, however one aspect i have no idea how to do is to do a check to make sure that the same multiplication problems do get generated twice, so something like 3 * 2 wouldnt have 2*3 or 3*2 show up again... I thought that perhaps doing the factorial of each randomly generated number but i tried it as you can see here and i dont think it works.. any help would be sweet.

#include <iostream>
#include <cmath>
#include <iomanip>
#include <cstdlib>
#include <time.h>

//double long Factorial ( int ) ;
using namespace std;



int main()
{
		//DECLARATIONS
int  u[11], r[11], t[11], answer[11], correct[11], value[11];		//aa = answer
int a=0, seed, c; //c is correct answers
int randvalue[11], randvalue2[11] ;

cout<<"please enter a starting number:";
cin>>seed;
srand(seed);
cout<<endl;


c=0;
int p=1;




	for (int i=1; i<=10; i++)	
	{
randvalue[i] = rand() % 10 ;
randvalue2[i] = rand() %10 ;
correct[i] = randvalue[i] * randvalue2[i];
	}
/*value[i] = Factorial (randvalue[i]) + Factorial (randvalue2[i]);
	


u[i] = Factorial (randvalue[i]);
r[i] = Factorial (randvalue2[i]);
t[i] = u[i]+r[i];
cout<<u[i];

while (value[i] = t[i])
{
randvalue[i] = rand() % 10 ;
randvalue2[i] = rand() %10 ;
correct[i] = randvalue[i] * randvalue2[i];
}
	}*/

while (p<=10)
{

cout << "Problem "<<p<<": What is "<<randvalue[p]<<" * "<<randvalue2[p]<<"?:";
cin >> answer[p];
	



if (answer[p] == correct[p])
{	
cout<<"Correct!\n";
	c++;
}
else
{
cout<<"Incorrect\n";
}
p++;
}

cout<< "Your score is "<<c<<"out of 10\n";
cout<<"\nLets Review the ones you missed: \n";
cout<<"\nPROBLEM:     |     YOUR ANSWER:\n";
cout<<"-------------------------------\n";

for (i=0; i<=10; i++)

if (answer[i] != correct[i])
cout <<randvalue[i]<<" * "<<randvalue2[i]<<" = "<<correct[i]<<"               "<<answer[i]<<endl;



return 0;
}

/*double long Factorial ( int  Number )      //  function's heading
{
double long NFACT = 1 ;
	if (Number == 0 )
		return NFACT ;
	else
		NFACT = Number * Factorial(Number - 1 ) ;
	return NFACT ;
}*/

[iamthwee]

kisvirag21
however one aspect i have no idea how to do is to do a check to make sure that the same multiplication problems do get generated twice

Are u sure that is even ur part of ur homework kiddo? Check wit ur teacher.

kisvirag21
I thought that perhaps doing the factorial of each randomly generated number

Er...that wont work.