random math teacher

[idono]

Im having trouble with connecting a random math problem to the correct answer its i don't know if its my logic or am i missing something to connect the random 2 numbers with the correct answer at the bottom.


#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main ()

{
int maxrange = 100 ,expression,right_number;
unsigned seed = time (0);

expression = 1 + rand() % maxrange;

cout <<"please add these two numbers"<<endl;
cout <<" "<<endl<<endl<<endl;
cout <<" "<< rand() % 100 <<endl;
cout <<" "<< rand() % 100 <<endl;
cout <<"+____"<<endl;

cout <<"what is the correct number:";
cin >>right_number;

if (right_number <= 0)
{
cout <<"the answer you gave is wrong"<<endl;
}

if (right_number == rand() % 100)
{
cout <<"the answer you gave is corrent whee.."<<endl;
}

if (rand() % 100 < right_number)
{
cout <<"the number you enter is wrong"<<endl;
}




return 0;

}

[mikeb570]

Please use [code]Your code here[/code]

Each time you call rand() % 100 it is going to be a different number. So where you are checking to see if it is right or not, is checking if you guessed correctly a random number from 0 to 99.

You'll should make variables to hold the random numbers that were generated. Lets say

int a = rand % 100 + 1
int b = rand % 100 + 1

Now a and b are ints between 1 and 100. Then for your if's do something like

if(right_number == (a + b))
     cout << "Correct" << endl;
else
     cout << "Wrong" << endl;

[idono]

im geting an error with the % agian how do i fix this?


#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main ()

{ int maxrange = 100,expression,right_number,a = rand % 100 + 1,b = rand % 100 + 1;

unsigned seed = time (0);

//expression = 1 + rand() % maxrange;

cout <<"please add these two numbers"<<endl;
cout <<" "<<endl<<endl<<endl;
cout <<" "<< rand() % 100 <<endl;
cout <<" "<< rand() % 100 <<endl;
cout <<"+____"<<endl;

cout <<"what is the correct number:";
cin >>right_number;

if (right_number == (a + b))
{
cout <<" great you did it ! "<<endl;
}

else {
cout <<" sorry your wrong "<<endl;
}


return 0;

}

[Mitsakos]

You forgot the parenthesis at your first rand (where you initialize a and b
a = rand() % 100 + 1,b = rand() % 100 + 1

Also you have an logic error.
At the beginning of the main you have
int a = rand() % 100 + 1,b = rand() % 100 + 1
You assign to a and b some random numbers between 0 and 100.
When you prompt the user with the numbers you have:

cout <<" "<< rand() % 100 <<endl;
cout <<" "<< rand() % 100 <<endl;

Which generates two new random numbers.
Then you are trying to find if he had the correct answer by checking if his answer is (a+b).
What you prompt the user to add is different than what you want him to add.
You should have:

cout <<" "<< a <<endl;
cout <<" "<< b <<endl;

That way you are giving him the numbers you generated at the beginning and then you check if he has the sum of those two.

Hope this helps

[PWWWWR]

#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std; 

int RND(int max)
{
	return (int)(rand()*max);
}
int main ()
{
	int a, b, ans;
	int maxrange = 100;
	while (true)
	{
		a = RND(maxrange);
		b = RND(maxrange);
		cout << "Please add these two numberz: " << a << " + " << b << endl;
		cin >> ans;
		if (ans == a + b)
		{
			cout << "You are correct." << endl;
		}
		else
		{
			cout << "You are incorrect.  You get no cake." << endl;
		}
	}
	return 0;
}

Weeeee!

[Mitsakos]

Why would you declare a new RND function that returns a call to rand when the rand() can do it by itshelf?

Also to have a number between 0 and maxrange you have to use a = rand() % maxrange

[Aakanaar]

I am also guessing this isn't the whole code? You have a while (true) which is an infinate loop, and i see nothing to exit out of the loop. No return, no break, no anything.

[PWWWWR]

It's called manual labor.... Breaking the process by yourself :)*

Yeah, I guess I had the rand() thing all wrong. Every random number generator I've seen returns a decimal. But not C++.... Odd.


*-requires certain compliers