// Prog: random.h
// define a class for pseudorandom numbers.
namespace ifm {
// class random: definition
class random {
public:
// POST: *this is initialized with the linear congruential
// random number generator
// x_i = ( a * x_{i-1} + c) mod m
// with seed x0.
random(const unsigned int a, const unsigned int c,
const unsigned int m, const unsigned int x0);
// POST: return value is the next pseudorandom number
// in the sequence of the x_i, divided by m
double operator()();
private:
const unsigned int a_; // multiplier
const unsigned int c_; // offset
const unsigned int m_; // modulus
unsigned int xi_; // current sequence element
};
} // end namespace ifm
