prog2_05.cpp

c++经典理论课程源文件程序.第二部分源程序

// Program 2.5 Using Random Integers
#include <iostream>
#include <cstdlib>
#include <ctime>  
using std::cout;
using std::endl;
using std::rand;
using std::srand;
using std::time;

int main() {
  const int limit1 = 500;  // Upper limit for on set of random values
  const int limit2 = 31;   // Upper limit for another set of values

  cout << "First we will use the default sequence from rand().\n";
  cout << "Three random integer from 0 to " << RAND_MAX << ": "
       << rand() << " " << rand() << " " << rand()<< endl;

  cout << endl << "Now we will use a new seed for rand().\n";
  srand(static_cast<unsigned int>(time(0)));               // Set a new seed

  cout << "Three random integer from 0 to " << RAND_MAX << ": "
       << rand() << " " << rand() << " " << rand()<< endl;
  return 0;
}