pr0504.cpp

来自「《C++编程习题与解答》书中所有例题与习题的源代码」· C++ 代码 · 共 16 行

//  Programming with C++, Second Edition, by John R. Hubbard
//  Copyright McGraw-Hill, 2000
//  Problem 5.4 on page 112
//  Testing a Trigonometric Identity

#include <iostream>  // defines the cin and cout objects
using namespace std;

int main()
{ for (double x=0; x < 2; x += 0.2)
  { double s=sin(x);
    double c=cos(x);
    cout << s*s << "\t" << c*c << "\t" << s*s+c*c << endl;
  }
}