void is a special type indicating the absence of any value. There are no objects of void; instead, void is used for deriving more complex types.

Void Functions

Use the void keyword as a function return type if the function does not return a value.

void print_temp(char temp) {
  Lcd_Out_Cp("Temperature:");
  Lcd_Out_Cp(temp);
  Lcd_Chr_Cp(223);  // degree character
  Lcd_Chr_Cp('C');
}

Use void as a function heading if the function does not take any parameters. Alternatively, you can just write empty parentheses:

main(void) { // same as main()
 ...
}

Generic Pointers

Pointers can be declared as void, which means that they can point to any type. These pointers are sometimes called generic.

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