function difference - “Parameter” vs “Argument”

parameters method (2)

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Arguments or parameters?

I got parameter and argument kind of mixed up and did not really pay attention to when to use one and when to use the other.

Can you please tell me?


A parameter is the variable which is part of the method’s signature (method declaration). An argument is an expression used when calling the method.

Consider the following code:

void Foo(int i, float f)
    // Do things

void Bar()
    int anInt = 1;
    Foo(anInt, 2.0);

Here i and f are the parameters, and anInt and 2.0 are the arguments.

Or may be its even simpler to remember like this, in case of optional arguments for a method:

public void Method(string parameter = "argument") 


parameter is the parameter, its value, "argument" is the argument :)

function parameters language-agnostic arguments terminology