Function calls & parameters

C uses which parameter passing strategy?

Pass-by-value

How do you simulate pass-by-reference in C?

Passing pointer addresses

What is copied in pass-by-value?

Only the value

What is copied in pass-by-reference (pointers)?

Pointer address

int a = 3;

void foo(int x){ x = x + 4; }

int main(){ foo(a); printf("%d", a); }

3

void f(int* p){ *p += 10; }

int x = 5;

f(&x);

printf("%d", x);

15

What does return type “void” mean?

Returns nothing

What is a function prototype?

Declaration

A function prototype must appear:

Before main()