Dev C++ |Random Coding| Not Working!

[oobootsy1]

i am now trying to make random values. here is my simple lil program to learn more about it. it has a error when i compile tho.

#include <iostream>
#include <cstdlib>

const int LOW = 1;
const int HIGH = 6;

int main()
{
int firstdie;
int secdie;

firstdie = rand() % (HIGH - LOW);
secdie = rand() % (HIGH - LOW);

cout << "You rolled a " << firstdie;
cout << "\n\nAnd you rolled a " << secdie;
system("pause");
}

the compiling errors are:

C:\My Documents\C++ Stuff\Un-Important Working Programs\random.cpp
[Warning] In function `int main()':

15 C:\My Documents\C++ Stuff\Un-Important Working Programs\random.cpp
`cout' undeclared (first use this function)

15 C:\My Documents\C++ Stuff\Un-Important Working Programs\random.cpp
(Each undeclared identifier is reported only once for each function it appears


thx alot!

[Lurker]

Add after includes:

using namespace std;

or even better:

using std::cout;
using std::rand;

[oobootsy1]

cant beleive i forgot that! thx so much man! check ur game thread too, i replied in it. but now, each time it is run, i roll a 1 and a 2 each time. im wondering if its that seeding the random value thing i have to do(which i dont understand and need help with), or just what i rolled. u know? thx

[manofsteel972]

use the following at the beginning of the program and only execute it once to seed the random number genrator with the system time

srand ( (unsigned)time(NULL) );

[oobootsy1]

execute it once? like compile the prog with that code in it(before int main() right?), then delte the code after? what do u exactly mean by execute the program only once? i might distribute the program or sumthin!

[SirCrono6]

He means, do NOT place srand in a loop or a recursive function. This is because if you have your seed set to
the clock and put in a loop, as you
know a loop takes much less than a second, so it will end up turning up the same thing till a second has
passed (assuming this is how you seed rand):

#include <iostream>
#include <cstdlib>
#include <ctime>

int main( void )
{
  int Number;
  srand( time( 0 ) ); //As I do it...
  Number = rand % ( 12 - 6 + 1 ) + 6; //This will generate a number between 12 and 6, substitue 12   
  std::cout << "You random number is: " << Number; //for your high number and 6 for your low...
  return 0;
}

An example of a bad way to use srand:

#include <iostream>
#include <cstdlib>
#include <ctime>

int main( void )
{
  int Number;
  for( int C = 0; C < 10; C++ )
  {
    srand( time( 0 ) );
    Number = rand % ( HIGH - LOW + 1 ) + LOW;
    std::cout << Number << ' ';
  }
  return 0;
}

Since the seed is placed in the loop and it is using seconds to seed rand, the loop will happen several times
a second, producing the same number several times. Say HIGH is 5, and LOW is 1:

1111444422...

That is an example, it will use the same number several times before switching to another number.

- SirCrono6

[oobootsy1]

wow, thx for the examale. lemme go try it, brb.