Defined in header <cstdlib> | ||
|---|---|---|
#define RAND_MAX /*implementation defined*/ |
Expands to an integer constant expression equal to the maximum value returned by the function std::rand. This value is implementation dependent. It's guaranteed that this value is at least 32767.
#include <climits>
#include <cstdlib>
#include <ctime>
#include <iostream>
int main()
{
// use current time as seed for random generator
std::srand(std::time(NULL));
std::cout << "RAND_MAX: " << RAND_MAX << '\n'
<< "INT_MAX: " << INT_MAX << '\n'
<< "Random value on [0,1]: "
<< static_cast<double>(std::rand()) / RAND_MAX << '\n';
}Possible output:
RAND_MAX: 2147483647 INT_MAX: 2147483647 Random value on [0,1]: 0.618608
| generates a pseudo-random number (function) |
|
| seeds pseudo-random number generator (function) |
|
C documentation for RAND_MAX |
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