How can C language determine if a pointer is empty?

1 year ago
William Carter
1 minute

In the C language, you can check if a pointer is NULL to determine if it is empty. NULL is a macro that represents a pointer not pointing to any valid memory address. You can use conditional statements to check if a pointer is empty, for example:

int* ptr = NULL;

if(ptr == NULL) {
    printf("指针为空\n");
} else {
    printf("指针不为空\n");
}

In the example above, ptr is assigned a value of NULL, so the condition statement ptr == NULL is true, resulting in “pointer is empty” being output. If ptr is pointed to a valid memory address, the condition statement is false, resulting in “pointer is not empty” being output.

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