Different type of function

There are two kind of function:

1. User defined function

2. Library function

User defined function:

User defined function is small or sub function created by programmer.

Library function:

Library function is some reserved function in c compiler such as printf();scanf(); etc. If you write printf(); the reserved commands for printf() function inside stdio.h file will be executed.
Look at this program

void function1(void)
    printf("function1 is called to main function n");
int main()
   function1();   //function is calling
   return 0;

Analysis: In the program ‘function1’ is a user defined function and ‘printf()’ is a library function.

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