?? randgentest.cpp
字號:
//: C21:RandGenTest.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// A little test of the random number generator
#include <algorithm>
#include <vector>
#include <iostream>
#include <functional>
#include <cstdlib>
#include <ctime>
using namespace std;
int main() {
const int sz = 10000;
int v[sz];
srand(time(0)); // Seed the random generator
for(int i = 0; i < 300; i++) {
// Using a naked pointer to function:
generate(v, v + sz, std::rand);
int count = count_if(v, v + sz,
bind2nd(greater<int>(), RAND_MAX/2));
cout << (((double)count)/((double)sz)) * 100
<< ' ';
}
} ///:~
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