How can I pass global variables into a function?

Which of the following is true "In case of pass by reference" (C programming)?

• In case of pass by reference 1. The location of variable in memory is passed to the function so that it can use the same memory area for its processing 2. The function declaration should contain ampersand (& ) in its type declaration 3. All of above 4. The values of those variables are passed to the function so that it can manipulate them i think it's 3 but i may be getting the pass/call confused. thanks.

• Answer:

  3. All of above The value of the variable REMAINS in place. All that is passed is an "address" to the variable in memory. When the function manipulates the variable, the background function has its variable value changed as well. #2 is correct because that *is* the syntax. #4 is incorrect, and is precisely why "all of the above" isn't the last choice.