C/CPP Order of Evaluation

1. C/CPP does not specifiy any order of evaluation of any PART of any expression

==> including function arguments 

==> but the sequential order of execution for the expressions is kept strictly

 see: Order of evaluation - cppreference.com

also: c++ - function parameter evaluation order - Stack Overflow

2. order of evaluation does not apply to the chained operations such as a + b + c

==> which is really compacted multiple expressions

==> whose sequential execution order depends on the associativity of the operator

see C++ Chain Operations_maxzcl的博客-优快云博客

3. Though the functional arguments do not have defined evaluation order, they

==> have a push order, which is right to left, so that the first argument is on top of the stack; it is done so that variadic function like printf() in C can work properly

see https://cboard.cprogramming.com/cplusplus-programming/92214-stack-push-order-function-arguments.html

==> the declared order of arguments does matter when default arguments are involved; it is usually more convenient to put the most frequently changed arguments at the front

see Does order of parameters matter? - C++ Forum