Random number c++ in some range [duplicate]

Question

Possible Duplicate:
Generate Random numbers uniformly over entire range

I want to generate the random number in c++ with in some range let say i want to have number between 25 and 63.

How can I have that?

Answer 1

Since nobody posted the modern C++ approach yet,

#include <iostream> #include <random> int main() {     std::random_device rd; // obtain a random number from hardware     std::mt19937 gen(rd()); // seed the generator     std::uniform_int_distribution<> distr(25, 63); // define the range      for(int n=0; n<40; ++n)         std::cout << distr(gen) << ' '; // generate numbers } 

Answer 2

You can use the random functionality included within the additions to the standard library (TR1). Or you can use the same old technique that works in plain C:

25 + ( std::rand() % ( 63 - 25 + 1 ) )