[問題]關於三角函數裡面丟變數
各位前輩您好,關於三角函數裡面丟變數，產生了一些問題，程式如下
希望能為我解答
#include "stdafx.h"
#include "iostream"
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <complex>
using namespace std;
double PI = 3.1415918;
int _tmain(int argc, _TCHAR* argv[])
{
double dwave;
for(dwave=500;dwave<=500;dwave++)// define Wavelength axis
{
int i,j;
const double fND = 500/4;//nf*df = wave / 4
double dAngleDegree = 2 * PI *fND / dwave;
cout <<cos(dAngleDegree)<<endl;
cout <<dAngleDegree<<endl;
cout <<cos(1.5708)<<endl;
}
system("PAUSE");
}
最後結果
4.26795e-007
1.578
-3.67321e-006
照理說cos(dAngleDegree)=cos(1.5708)=-3.67321e-006
但cos(dAngleDegree)=4.26795e-007
請問是哪裡出問題
謝謝各位大大解答，萬分感謝
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