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[c++] Randomnize an integer?

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Engineer
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Posted: Wed Jan 23, 2008 11:09 am Post subject: [c++] Randomnize an integer?

insert title here

NINTENDO
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Posted: Wed Jan 23, 2008 11:13 am Post subject: Re: [c++] Randomnize an integer?

_________________ Intel over amd yes.

Reak
I post too much

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Posted: Wed Jan 23, 2008 11:15 am Post subject:

Random()

Engineer
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Posted: Wed Jan 23, 2008 12:20 pm Post subject: Re: [c++] Randomnize an integer?

Reak
I post too much

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Joined: 15 May 2007
Posts: 3496

Posted: Wed Jan 23, 2008 12:33 pm Post subject:

Code:

yourinteger = Rand(1337)

If Random is the same as Rand, then it will your integer to a number betwen 1~1337 or -1337~1337.

Engineer
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Posted: Wed Jan 23, 2008 1:00 pm Post subject:

Code:

error:'random' cannot be used as a function;
error: the address of 'int rand()' will always evaluate as true;

lurc
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Posted: Wed Jan 23, 2008 1:14 pm Post subject:

Code:

#include <time.h>
// or #include <ctime>
...
int iRandom = rand() % 10 + 1;

Generates a Number 1 - 10 ( hence the +1, if that wasnt there it would generate 0 - 9 )

where rand() is the function
% MAX_RAND which is the highest array of numbers you want to generate
+ 1 just increases the number by 1 so you can have 1-100 instead of 0-99

Edit: but seriously, i googled this just now and found the first link

http://www.cplusplus.com/reference/clibrary/cstdlib/rand.html
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killersamurai
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Posts: 197
Location: Colorado

Posted: Wed Jan 23, 2008 3:58 pm Post subject:

Generating a random number with a given range:

Say we want to have a range of 15 min - 25 max.
The default would be

Code:

int ran = rand() % 26;

This will give us a range of 0 - 25. We will now shift it.

Code:

int ran = 15 + rand() % 26;

This will give us a range of 15 - 40, but we want it to 25. To fix it, we just subtract it by 15.

Code:

int ran = 15 + rand() % (26 - 15);

This will give use our desired range 15 - 25. With this, you can form an equation to use in a function

Code:

x = min
y = max

x + rand() % ((y + 1 ) - x)

lurc
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Posted: Wed Jan 23, 2008 5:29 pm Post subject:

using killersamurai's code up there, heres a simple function u can use

Code:

int Randomize( int iRandomMin, int iRandomMax )
{
int iRandNumber = iRandomMin + rand() % ((iRandomMax + 1 ) - iRandomMin);
return iRandNumber;
}

Example:

Code:

#include <iostream>
using std::cout;
using std::cin;

int Randomize( int iRandomMin, int iRandomMax )
{
int iRandNumber = iRandomMin + rand() % ((iRandomMax + 1 ) - iRandomMin);
return iRandNumber;
}

int main()
{
int iMin, iMax;
cout << "-- Randomizor --\n" << "\nChoose Mininum Value: ";
cin >> iMin;
cout << "\nChoose Maxium Value: ";
cin >> iMax;
cout << "Random Number from those numbers: " << Randomize( iMin, iMax ) << "\n";
cin.sync();
cin.ignore();
return 0;
}

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Jani
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Joined: 29 Dec 2006
Posts: 804

Posted: Thu Jan 24, 2008 8:49 am Post subject: Re: [c++] Randomnize an integer?

http://www.boost.org/libs/random/

ZzOoZz wrote:

Rand() is the function, but how do i set the int to change?

srand()

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