What does ⅱ mean in C language?

In C language, ii is a predefined macro that represents the imaginary unit, that is, a complex number whose square root is -1. It is often used in complex number arithmetic, for example to represent the complex number 3 4i as complex_number = 3 4 * ii. Note that ii is predefined and cannot be confused with the integer 2.

In c language, ii

In c language, ii is a predefined macro that represents an imaginary unit, that is, a complex number whose square root is -1.

Structure

##ii The structure is as follows:

<code class="c">#define ii sqrt(-1)</code>

Among them:

## The ##define
• directive defines a preprocessor macro.
sqrt
• Function calculates the square root of a number.
-1
• is a constant, representing -1.

Usage

#ii

Usually used in complex number operations. For example, the complex number 3 4i can be represented as: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">&lt;code class=&quot;c&quot;&gt;complex_number = 3 + 4 * ii;&lt;/code&gt;</pre><div class="contentsignin">Copy after login</div></div>where:

complex_number
• is a variable representing a complex number.
3
• is the real part of the complex number.
4 * ii
• is the imaginary part of the complex number, where 4 is the coefficient of the imaginary part, and ii is the imaginary unit.

Note

ii
• Macros are predefined and do not need to be explicitly defined in the program. The value of
ii
• is always a complex unit with a square root of -1.
ii
• must not be confused with the integer 2.

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