VC下使用复数示例（建议使用“用法一”）

用法一

#include <math.h>
#include <complex>
using namesPACe std;
typedef complex<double> Complex;

int main(int argc, char* argv[])
{
	Complex a,b,c;
	a = Complex::complex(1.,.2);		//赋初值
	printf("%f,%fn",real(a),imag(a));	//real()取实部,imag()取虚部
	b = Complex::complex(1.,.2);		//赋初值
	c = Complex::complex(1.,.2);		//赋初值
	a = b + c;
	printf("%f,%fn",real(a),imag(a));
	double k=2.0;	//数乘的时候数的类型一定要和复数中

实部和虚部的类型相同，此处为double
	a = k * a;	//所有需要和复数运算的实数都要定义为和实部虚部类型相同
	printf("%f,%fn",real(a),imag(a));

	return 0;
}

******************************************************************

用法二


#include <math.h>
#include <complex>

int main(int argc, char* argv[])
{
	std::complex<double> x,y,z;
	x = std::complex<double> (1.,.02);
	printf("x = %f,j%fn",std::real(x),std::imag(x));
	y = std::complex<double> (1.,.02);
	z = std::complex<double> (1.,.02);
	x = y * z;
	printf("x = %f,j%fn",std::real(x),std::imag(x));
	return 0;
}

******************************************************************

用法三

#include <math.h>

int main(int argc, char* argv[])
{
	_complex c_val1,c_val2,c_val3;
	c_val1.x = 1.;
	c_val1.y = .2;
	c_val2.x = 1.;
	c_val2.y = .2;
	c_val3.x = c_val1.x + c_val2.x;
	c_val3.y = c_val1.y + c_val2.y;
	printf("sum = %f,j%fn",c_val3.x,c_val3.y);
	return 0;
}