What is parameter passing? name three ways of passing parameter during subroutine call?

Question

computer architecture

Answer 1

A subroutine takes parameters, variables set when it's called.  The caller passes values for those parameters.  Depending on the language, you can either pass a value, or a pointer (aka reference) to that value.  Beats me what the 3rd way is, and I've programmed for 30 years.  Maybe your teacher wants to hear IN, OUT and IN/OUT, referring to the direction the value passes.

Answer 2

A way of sending argument(s) to a routine.

Pass by

1. Reference - address of the argument is passed into the sub, so that its value may be changed.

2. Value - A copy of the argument is passed into the sub, so the actual arg is not changed, only the copy.

3. Result Value - Is a combo of pass by value and pass by Reference.

The argument is passed by reference, the sub makes a temp copy of the argument. Then it uses the temp argument, and when the sub is done, it copies the tmp argument back into the original argument.

Answer 3

Parameter passing methods  are the ways in which parameters are transfered between functions when one function calls another. C++ provides two parameter passing methods--pass-by-value  and pass-by-reference .

1: pass by value,

2: pass by reference

for example:

if u have toswap the value of two varaibles :- say i and j than : using first method:

void main()

{

  int  i  = 20 , j   = 10;

  swap(i, j)// passed by value

}

int swap(int x, int y)

{

.....................

}

II method............

void main()

{

swap(&i, &j)// pass by reference.

}

Answer 4

direct, indirect, indexed