Prototyping help needed

[Dave Kraft]

Hi,
I have a question:
How come the following small program works under Turbo C 1.5 and not under
Unix?

main()
{
	int a = 0, b = 0, c;
	int add(int, int);

	printf("\nEnter 2 ints:  ");
	scanf("%d%d", &a, &b);
	c = add(a, b);
	printf("\nc = %d\n\n", c);
}
int add(int a, int b)
{
	return(a + b);
}

Now, when I code it as follows:

main()
{
	int a = 0, b = 0, c;
	int add(int, int);

	printf("\nEnter 2 ints:  ");
	scanf("%d%d", &a, &b);
	c = add(a, b);
	printf("\nc = %d\n\n", c);
}
int add(a, b)
int a, b;
{
	return(a + b);
}

It works as it should.  Why??

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