What does (x) mean in C language?

In C language, the & operator represents the address operator, which is used to obtain the memory address of a variable or expression. This address is usually stored in a pointer variable pointing to a memory location. Its main uses include obtaining variable addresses, passing reference parameters, obtaining pointer types, etc. For example, int *ptr = &x; means getting the address of variable x and storing it in the pointer variable ptr.

The meaning of (x) in C language

## in C language #(x) is an operator, called the address operator. Its purpose is to get the address (memory location) of a variable or expression.

How it works:

When the expression

(x) is evaluated, it returns the address of the memory location where the variable or expression is located. This address is usually stored in a pointer variable pointing to a memory location.

Usage:

& Operator is mainly used in the following scenarios:

• Get Address of variable: int x = 10; int *ptr = &x;
• Pass reference parameter: void myFunction(int *ptr) ;
• The array name itself is the address of the first element of the array: int arr[] = {1, 2, 3}; int *ptr = arr;
• Get pointer type: int *ptr; printf("%d", sizeof(*ptr)); // Output: 4 (pointer size)

Example:

<code class="c">int main() {
    int x = 10;
    int *ptr = &x;  // 获取变量 x 的地址
    printf("地址：%p\n", ptr);  // 打印地址
    printf("值：%d\n", *ptr);  // 通过指针访问值
    return 0;
}</code>

Output:

<code>地址：0x7ffe323efb2c
值：10</code>

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