如何使用复数"i"?在C ++中

问题描述

我现在正在编码一个简单的DFT算法，我想在复指数中使用复数i.我看到有人使用#include<complex>和#include<cmath>，然后他们使用了重载的符号I(例如exp(2*I)).但似乎在我的Visual Studio编译器中不起作用.那么，有人可以举一个使用复指数的简单例子吗?谢谢！

I am coding a simple DFT algorithm now and I want to use the complex number i in complex exponential. I saw somebody use #include<complex> and #include<cmath>, and then they used the overloaded symbol I such as exp(2*I) . But it seems it doesn't work in my visual studio compiler. So, can anyone give a simple example of using complex exponential? Thanks!

推荐答案

下面是一个简短的完整示例:

Here is a short complete example:

#include <iostream>
#include <complex>
#include <cmath>

using namespace std;
typedef complex<double> dcomp;

main() {
  dcomp i;
  dcomp a;
  double pi;
  pi = 2 * asin(1);
  i = -1;
  i = sqrt(i);
  a = exp(2*pi*i);
  cout << "i is " << i << "and Euler was right: e(i pi) = " << a << endl;
} 

经过g ++测试

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