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Function Parameter Evaluation Order

Friday, June 24, 2005 by digitalpeer

It's worth noting that parameter expressions are evaluated like everything else from right to left. Of course, this only matters when passing at least one argument expression to a function that may change the value of another argument.

#include <stdio.h>

void func(int a, int b, int c, int d)
{
	printf("%d %d %d %d\n",a,b,c,d);
}

int main()
{
	int x = 0;
	func(++x,++x,++x,++x);
	return 0;
}

Results in the following:

4 3 2 1