What is the purpose of the isempty function in the C language?

In C language, there is no built-in isempty() function provided. Typically, you can determine if a variable is empty by checking its value. In C language, you can use the following methods to check if a variable or string is empty:

1. For primitive data types:

int num;
// 判断num是否为空
if(num == 0) {
    // num为空
} else {
    // num不为空
}

1. For string variables:

char str[10] = "Hello";
// 判断str是否为空
if(str[0] == '\0') {
    // str为空
} else {
    // str不为空
}

Judgment should be based on the specific types of variables and usage scenarios.