Random floats in C++

Question

How can I get a random number between, say, 1.001 and 2.999?

Answer 1

Generally you initialize the seed using the current time. Here's a full example:

#include <iostream>
#include <random>
#include <ctime>

float random_float(float min, float max) {

return ((float)rand() / RAND_MAX) * (max - min) + min;

}

int main() {

srand(time(NULL));

// Print 100 random floats between 1.001 and 2.999.
for (int i = 0; i < 100; ++i)
std::cout << random_float(1.001f, 2.999f) << std::endl;

return 0;

}

Answer 2

My approach is:

float random_float(float min, float max) {

return ((float)rand() / RAND_MAX) * (max - min) + min;

}

Then you can call it like:

random_float(1.001f, 2.999f);

Of course, make sure to include <random> and initialize the seed with srand.

Answer 3

how do I initialize the seed? Also can you give an example?

Answer 4

great, thanks!

Answer 5

What is RAND_MAX? Is that a constant value from random library?

Answer 6

I can't understand. Have any easy way it's more than ?

Answer 7

I can't understand. Have any easy way it's more than ?