_imaginary usage in c language

In C language, the _imaginary macro is used to obtain the imaginary part of a complex number. The usage is as follows: declare a complex variable in the format a bi (a is the real part, b is the imaginary part). Use the _imaginary(z) function to get the imaginary part of the complex number z. The _imaginary function returns type double even if the input complex number is of type complex float.

Usage of _imaginary in C language

In C language, _imaginary is A macro used to represent the imaginary part of complex numbers. Its usage is as follows:

Format:

#include <complex.h>

double _imaginary(complex double z);
float _imaginary(complex float z);

Parameters:

• z: A complex number represented as a bi, where a is the real part and b is the imaginary part.

Return value:

• b, the imaginary part of the complex number z.

Example:

#include <complex.h>

int main() {
    complex double z = 3.0 + 4.0i;

    // 获取虚部
    double imaginary_part = _imaginary(z);

    // 输出虚部
    printf("虚部：%f\n", imaginary_part);

    return 0;
}

Output:

<code>虚部：4.000000</code>

Notes:

• _imaginary can only be used for complex numbers, not real numbers. The result of
• _imaginary is always of type double, even if the input complex number is of type complex float.

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