real()函数在复杂的头文件中定义。 real()函数用于查找复数的实部。
句法:
template T
real(const complex& z);
参数:此方法采用必填参数z:,它表示给定的复数。
返回值:返回指定复数的实数部分。
下面的程序说明了上述函数:-
范例1:-
// C++ program to demonstrate
// example of real() function.
#include
using namespace std;
// driver function
int main()
{
// defines the complex number: (20.3 + 4.9i)
complex realpart(20.3, 4.9);
// print the complex number
cout << "Complex Number = "
<< realpart << endl;
// prints the real part using the real function
cout << "Real part of the complex number is ="
<< real(realpart) << endl;
return 0;
}
输出:
Complex Number = (20.3, 4.9)
Real part of the complex number is =20.3
示例2:
// C++ program to demonstrate
// example of real() function.
#include
using namespace std;
// driver function
int main()
{
// defines the complex number: (2 + 2i)
complex realpart(2, 2);
// print the complex number
cout << "Complex Number = "
<< realpart << endl;
// prints the real part using the real function
cout << "Real part of the complex number is ="
<< real(realpart) << endl;
return 0;
}
输出:
Complex Number = (2, 2)
Real part of the complex number is =2
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