RAND_MAX - cppreference.com (original) (raw)
| | | | | ---------------------------------------------- | | | | #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.
[edit] Example
#include #include #include #include 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(std::rand()) / RAND_MAX << '\n'; }
Possible output:
RAND_MAX: 2147483647 INT_MAX: 2147483647 Random value on [0,1]: 0.618608