complex::operator*=

發行項
07/29/2015

Multiplies a target complex number by a factor, which may be complex or be the same type as are the real and imaginary parts of the complex number.

template<class Other>
   complex& operator*=(
      const complex<Other>& _Right
   );
complex<Type>& operator*=(
   const Type& _Right
);
complex<Type>& operator*=(
   const complex<Type>& _Right
);

Parameters

_Right
A complex number or a number that is of the same type as the parameter of the target complex number.

Return Value

A complex number that has been multiplied by the number specified as a parameter.

Remarks

The operation is overloaded so that simple arithmetic operations can be executed without the conversion of the data to a particular format.

Example

// complex_op_me.cpp
// compile with: /EHsc
#include <complex>
#include <iostream>

int main() {
   using namespace std;
   double pi = 3.14159265359;

   // Example of the first member function
   // type complex<double> multiplied by type complex<double>
   complex <double> cl1 ( polar ( 3.0 , pi / 6 ) );
   complex <double> cr1 ( polar ( 2.0 , pi / 3 ) );
   cout << "The left-side complex number is cl1 = " << cl1 << endl;
   cout << "The right-side complex number is cr1 = " << cr1 << endl;

   complex <double> cs1 = cl1 * cr1;
   cout << "Quotient of two complex numbers is: cs1 = cl1 * cr1 = "
        << cs1 << endl;

   // This is equivalent to the following operation
   cl1  *= cr1;
   cout << "Quotient of two complex numbers is also: cl1 *= cr1 = "
        << cl1 << endl;

   double abscl1 = abs ( cl1 );
   double argcl1 = arg ( cl1 );
   cout << "The modulus of cl1 is: " << abscl1 << endl;
   cout << "The argument of cl1 is: "<< argcl1 << " radians, which is " 
        << argcl1 * 180 / pi << " degrees." << endl << endl; 

   // Example of the second member function
   // type complex<double> multiplied by type double
   complex <double> cl2 ( polar ( 3.0 , pi / 6 ) );
   double cr2 = 5.0;
   cout << "The left-side complex number is cl2 = " << cl2 << endl;
   cout << "The right-side complex number is cr2 = " << cr2 << endl;

   complex <double> cs2 = cl2 * cr2;
   cout << "Quotient of two complex numbers is: cs2 = cl2 * cr2 = " 
        << cs2 << endl;

   // This is equivalent to the following operation
   cl2  *= cr2;
   cout << "Quotient of two complex numbers is also: cl2 *= cr2 = "
        << cl2 << endl;

   double abscl2 = abs ( cl2 );
   double argcl2 = arg ( cl2 );
   cout << "The modulus of cl2 is: " << abscl2 << endl;
   cout << "The argument of cl2 is: "<< argcl2 << " radians, which is " 
        << argcl2 * 180 / pi << " degrees." << endl;
}

Sample Output

The left-side complex number is cl1 = (2.59808,1.5)
The right-side complex number is cr1 = (1,1.73205)
Quotient of two complex numbers is: cs1 = cl1 * cr1 = (-6.21281e-013,6)
Quotient of two complex numbers is also: cl1 *= cr1 = (-6.21281e-013,6)
The modulus of cl1 is: 6
The argument of cl1 is: 1.5708 radians, which is 90 degrees.

The left-side complex number is cl2 = (2.59808,1.5)
The right-side complex number is cr2 = 5
Quotient of two complex numbers is: cs2 = cl2 * cr2 = (12.9904,7.5)
Quotient of two complex numbers is also: cl2 *= cr2 = (12.9904,7.5)
The modulus of cl2 is: 15
The argument of cl2 is: 0.523599 radians, which is 30 degrees.

Requirements

Header: <complex>

Namespace: std

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