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bookPass by Value

When we pass function arguments, there are two ways to do this:

  • By value: the function's variable copies the parameter's value without changing the argument.
  • By reference: the function's variable copies the reference of the parameter by changing the argument.

By value:


              
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void incValue(int x) {
    x++;
}

int main() {
    int x = 1;
    incValue(x);
&nbsp;&nbsp;&nbsp;&nbsp;cout << x; 
&nbsp;&nbsp;&nbsp;&nbsp;return 0;
}
copy

As you can see by the output, x didn't change since we changed the copy of x in the function incValue().

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Sektion 4. Kapitel 7

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bookPass by Value

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When we pass function arguments, there are two ways to do this:

  • By value: the function's variable copies the parameter's value without changing the argument.
  • By reference: the function's variable copies the reference of the parameter by changing the argument.

By value:


              
12345678910

            
void incValue(int x) {
&nbsp;&nbsp;&nbsp;&nbsp;x++;
}

int main() {
&nbsp;&nbsp;&nbsp;&nbsp;int x = 1;
&nbsp;&nbsp;&nbsp;&nbsp;incValue(x);
&nbsp;&nbsp;&nbsp;&nbsp;cout << x; 
&nbsp;&nbsp;&nbsp;&nbsp;return 0;
}
copy

As you can see by the output, x didn't change since we changed the copy of x in the function incValue().

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 7
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