純C/C++ sin、cos和『角度(degree)轉弳度(radian)』的教學

 

資料來源:http://stackoverflow.com/questions/9347947/problems-with-math-h

線上執行結果: http://codepad.org/HD6jX0YY

Code

#include <cmath>
#include <iostream>

using namespace std;
const double PI=3.14159;//常數定義宣告

double degrees_to_radian(double deg)
{
    return deg * PI / 180.0;
}

int main()
{
    cout << "sin(45.0) = " << sin(degrees_to_radian(45)) << endl;
    cout << "cos(45.0) = " << cos(degrees_to_radian(45)) << endl;
}