There are three procedures to call a function.
1. Normal Calling Procedure: If a function calls any other function or any function is called by another function, it is referred as normal calling procedure of function.
For Example: If the body of function func1() contains calling statement of func2() so that control first of all will execute func1() and when it will find calling statement of func2() it will jump to the body of func2() to execute its body. After complete execution of called function control will return to the calling function.