!What is equal to a in C language?

In C language, the ! operator represents the logical NOT operation, which converts the operand to a Boolean value and returns its opposite: 0 (false) if the operand is non-zero. If the operand has a zero value, returns 1 (true).

!a is equal to what in C language

In C language,! operator represents the logical NOT operation, which converts the operand to a Boolean value and returns its opposite value.

The calculation rules for logical NOT operations are:

• If the operand is a non-zero value, 0 (false) is returned
• If The operand has a zero value, then 1 (true) is returned

So, for variable a:

• if a is not If !a is zero (not equal to 0), then
!a
• returns 0If a is zero (equal to 0), then
!a

returns 1

Example:

Assume the value of

a

is 5, then: <pre class="brush:php;toolbar:false">&lt;code&gt;!a = !(5) // 5 不等于 0 !a = 0 // 返回 0（假）&lt;/code&gt;</pre>On the contrary, if

a# The value of ## is 0, then: ###

<code>!a = !(0)  // 0 等于 0
!a = 1    // 返回 1（真）</code>

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