function - Parameter Passing in C - Pointers, Addresses, Aliases -

Can someone please understand the difference between parameters passed in C ? According to Professor notes there are 4 different ways to pass the parameter

1. Call-by-value
2. Call-by-address (pointer)
3. Call If you can kindly give an example, I appreciate it, and your work will be appreciated.

1. call-by-value

   Passing the value of a function as the parameter if the function modifies the variable, the actual variable will not change .

     Zero Funny 1 (Intmuprum) {myParam = 4; } Zero main () {int myValue = 2; Fun1 (myValue); Printf ("myValue =% d", myValue);  

   myValue will always be 2.

2. Call-by-address (pointer)

   Fun to zero 1 (Int * MyMuram) {* MyParam = 4; } Zero main () {int myValue = 2; Fun1 (& myValue); Printf ("myValue =% d", myValue); }

   Here we are giving the address of myValue to fun1 . Therefore the value of myValue will be 4 at the end of main () .

3. Call-by -Lyas

   According to my understanding there is no surname in C. It should be the C ++ reference mechanism.

4. global variable / static variable

   The general location accessible by a collar and cali functions is both the calling The ones and colleagues will be able to access and modify them.

     int myValue = 2; Zero Funny 1 () {myValue = 4; } Zero main () {myValue = 2 fun1 (); Printf ("myValue =% d", myValue); }  

   As you can guess, the value of myValue will be 4 at the end of main () .

Hope it helps.