Predefined codes or the predefined functions are the codes small or large codes which are predefined by the maker of the language. In C++ the predefined codes can be included in the program by the header files. These codes are placed in files and functions could be used to access them. Like a simple console Code to output "Hello World" uses a predefined code cout<<"Hello World"; so this cout is already defined how it prints the text or much more know function from C language print( ); .
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Predefined functions are built-in functions that perform standard operations and that generally do not depend on any classes. A predefined void function is simply a predefined function that has no return value. An example of a predefined void function is the abort() function which typically has the following signature: void abort(void);
public class Hello{//opens the classpublic static void main(String args[]){//opens the main methodSystem.out.println("Hello World");}//closes the main method}//closes the classNote: The compiler all the sentences that have "//" before them.
keywords are predefined words