How to add random numbers

[JosAH]

So do I type the variable int result after the unsigned seed??

You don't need an 'unsigned seed' variable either. Please don't try to program
by guessing and randomly (sic) copying and pasting snippets of code.

kind regards,

Jos

[namcintosh]

The following is statistically a bit incorrect, but for starters you could do:

int result= 1+rand()%500;

The variable 'result' will have a value in the interval [1, 500].

kind regards,

Jos

Well, I tried that, and this is what happened:

#include <iostream>
#include <cstdlib>
#include <time>
#include <conio>
using namespace std;

int main()
{
unsigned seed;


cout << "Enter a seed value: " ;
cin >> seed;
srand (seed);
int result= 1+rand()%500;When I key in this line, an error pops up that says "result is assigned to a value that is never used.
srand(time(0));
cout << rand() <<endl;
cout << rand() <<endl;

getch();
return 0;
}


Output Line:
Enter a seed value: 1
6978
10643


Run the program and you will see what I mean

[namcintosh]

You don't need an 'unsigned seed' variable either. Please don't try to program
by guessing and randomly (sic) copying and pasting snippets of code.

kind regards,

Jos

I am sooo confused! I'm not really good at this. I am following my textbook's instructions, but nothing seems to be working. Maybe I ought to work on another program and come back to this one.

[ilikepython]

Well, I tried that, and this is what happened:

#include <iostream>
#include <cstdlib>
#include <time>
#include <conio>
using namespace std;

int main()
{
unsigned seed;


cout << "Enter a seed value: " ;
cin >> seed;
srand (seed);
int result= 1+rand()%500;When I key in this line, an error pops up that says "result is assigned to a value that is never used.
srand(time(0));
cout << rand() <<endl;
cout << rand() <<endl;

getch();
return 0;
}


Output Line:
Enter a seed value: 1
6978
10643


Run the program and you will see what I mean

Like Jos just said you don't need a seed variable. You just need the
"srand(time(0)) " line before genrating the random numbers.
Also you don't need a result variable. Instead of, "cout << rand() << endl;"
put "cout << rand()%500 << endl;".
(

[namcintosh]

Like Jos just said you don't need a seed variable. You just need the
"srand(time(0)) " line before genrating the random numbers.
Also you don't need a result variable. Instead of, "cout << rand() << endl;"
put "cout << rand()%500 << endl;".
(

Okay, I got it!! Thanks so much!!!

I will show my completed program when I am finished.

:-) :-) :-) :-)

[namcintosh]

How to add random numbers

Does anyone have any idea how to add random numbers that are generated in C++?

[sicarie]

Does anyone have any idea how to add random numbers that are generated in C++?

namcintosh, you're familiar with our Posting Guidelines, so what have you tried with this?

[ilikepython]

Does anyone have any idea how to add random numbers that are generated in C++?

Unless I'm mistaken by what you mean, try the '+' sign.
That's pretty basic stuff, you shoud check out these websites:

http://www.cplusplus.com

http://www.cprogramming.com

They have good tutorials for beginners.

[sicarie]

namcintosh-

Please do not double-post your question. I have merged these threads.

[namcintosh]

Unless I'm mistaken by what you mean, try the '+' sign.
That's pretty basic stuff, you shoud check out these websites:

http://www.cplusplus.com

http://www.cprogramming.com

They have good tutorials for beginners.

well, I tried, but my input didn't come out right.

Here's what I mean:

int main()
{
        unsigned seed;

        cout << "Enter a seed value: " ;
        cin  >> seed;
        srand(time(0));
        cout << rand()%500 << endl;
        cout << rand()%500 << endl;
        cout << rand()%500 + rand()%500;
        getch();
        return 0;
}

Output:
Enter a seed value: 1
385
425
644

[sicarie]

well, I tried, but my input didn't come out right.

Here's what I mean:

int main()
{
        unsigned seed;

        cout << "Enter a seed value: " ;
        cin  >> seed;
        srand(time(0));
        cout << rand()%500 << endl;
        cout << rand()%500 << endl;
        cout << rand()%500 + rand()%500;
        getch();
        return 0;
}

Output:
Enter a seed value: 1
385
425
644

Please use code tags around your code - it makes everything much more readable.

What about that is not right? You never use your seed value, you cin it, but then set time(0) - the current system time - as the seed, not the number you cin.

[namcintosh]

Please use code tags around your code - it makes everything much more readable.

What about that is not right? You never use your seed value, you cin it, but then set time(0) - the current system time - as the seed, not the number you cin.

I'm confused. What do u mean???

[sicarie]

I'm confused. What do u mean???

About what?

Your variable? I think that's pretty self-explanatory. Look at the code you wrote, and look at the comment. Code tags are explained on the right-hand side of the screen when you respond, and are appreciated.

Other than that, you need to ask a more specific question. Your code is working, and returning values between 1 and 500...

[namcintosh]

About what?

Your variable? I think that's pretty self-explanatory. Look at the code you wrote, and look at the comment. Code tags are explained on the right-hand side of the screen when you respond, and are appreciated.

Other than that, you need to ask a more specific question. Your code is working, and returning values between 1 and 500...

All I am trying to figure out how to do is sum up those two random numbers. Do I store them as variables??

[Ganon11]

Yes, you will have to. Every time you call the rand() function, it generates a new random number. If you want to keep these numbers to do something with them, like adding, you will have to store the values of the rand() call into a variable, like this:

int num = rand();