function parameter evaluation order

Question

In C and C++, is there a fixed order for evaluation of parameter to the function? I mean, what do the standards say? Is it left-to-right or right-to-left<

Answer 1

Just only to speak for C language, the order of evaluation inside the function parameters depend on compiler. from The C Programming Language of Brian Kernighan and Dennis Ritchie;

Similarly, the order in which function arguments are evaluated is not specified, so the statement

printf("%d %d\n", ++n, power(2, n)); /*WRONG */

can produce different results with different compilers, depending on whether n is incremented before power is called. The solution, of course, is to write

++n;

printf("%d %d\n", n, power(2, n));