What is the purpose of void in the C language?

In C language, void is a special data type that represents “no type” or “no value”. The purpose of void is as follows:

1. The return type of a function can be void, which means the function does not return any value. For example, void func() indicates that the function does not return any value.
2. Function parameter type: void can be used as the type of a function parameter, indicating that the function does not accept any arguments. For example, void func(void) means that the function does not accept any arguments.
3. Pointer type: A void pointer is a general pointer type that can point to any type of data. For example, void *ptr can point to any type of data. However, when using a void pointer, type conversion is needed to manipulate specific data.

In conclusion, in the C language, void is used to represent situations where there is no type or no value, and can be used as a return type for functions, parameter type for functions, and a general pointer type.