complex::operator-=

從目標群組數目減去數字，減去的這個數字可能是複雜或和的型別將複數的虛擬和虛構區段。

template<class Other>
   complex<Type>& operator-=(
      const complex<Other>& _ComplexNum
   );
complex<Type>& operator-=(
   const Type& _RealPart
);
complex<Type>& operator-=(
   const complex<Type>& _ComplexNum
);

參數

• _ComplexNum
  從目標群組數字會減去的複雜數值。

• _RealPart
  從目標群組數字會減去的實數。

傳回值

與參數指定的數值的複雜數值從減去的。

備註

多載作業，因此簡單的算術運算可以執行，不需要資料轉換至特定格式。

範例

// complex_op_se.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> subtracted from type complex<double>
   complex <double> cl1 ( 3.0 , 4.0 );
   complex <double> cr1 ( 2.0 , -1.0 );
   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 << "The difference between the two complex numbers is:"
        << "\n cs1 = cl1 - cr1 = " << cs1 << endl;

   // This is equivalent to the following operation
   cl1 -= cr1;
   cout << "Complex number cr1 subtracted from complex number cl1 is:"
        << "\n 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 double subtracted from type complex<double>
   complex <double> cl2 ( 2.0 , 4.0 );
   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 << "The difference between the two complex numbers is:"
        << "\n cs2 = cl2 - cr2 = " << cs2 << endl;

   // This is equivalent to the following operation
   cl2  -= cr2;
   cout << "Complex number cr2 subtracted from complex number cl2 is:"
        << "\n 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 << endl;
}

需求

標題: <complex>

命名空間: std

請參閱

參考

complex Class