What does @ mean in C language?

In C language, the @ symbol has two meanings: Macro expansion operator: replaces the macro name with its definition. Address operator: returns the address of its operand, used for the address of a pointer pointing to a variable.

The meaning of the @ symbol in C language

In C language, the @ symbol has two main meanings:

1. Macro expansion operator

When the @ symbol is used for macro expansion, it will replace the macro name with its corresponding definition. For example:

<code class="c">#define MAX 100
int array[MAX];</code>

When expanding the statement int array[MAX];, the @ symbol replaces MAX with its definition 100, resulting in The following expanded statement:

<code class="c">int array[100];</code>

2. Address Operator

When the @ symbol is used for address operations, it will return the address of its operand. The operand can be a variable, array element, or structure member. For example:

<code class="c">int x = 10;
int *ptr = &x;</code>

In this code, &x represents the address of x, and ptr points to the address. Therefore, *ptr can access the value of variable x.

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