How to evaluate functions in GDB?
The syntax for calling a function in gdb is call pow(3,2) Type help call at the gdb prompt for more information.
evaluation
What’s the difference between XOR and NOT-EQUAL-TO?
For Boolean values, they mean the same thing – although there’s a compound assignment operator for XOR: x ^= y; There’s no equivalent compound assignment operator for inequality. As for why they’re both available – it would be odd for XOR not to be available just because it works the same way as inequality. It … Read more
Setting extra bits in a bool makes it true and false at the same time
In C++ the bit representation (and even the size) of a bool is implementation defined; generally it’s implemented as a char-sized type taking 1 or 0 as possible values. If you set its value to anything different from the allowed ones (in this specific case by aliasing a bool through a char and modifying its … Read more
SQL UPDATE order of evaluation
MySQL does “left to right” evaluation and does “see” the new values. (Tested on 5.0.45-community-nt-log MySQL Community Edition) Furthermore, from the MySQL manual: “Single-table UPDATE assignments are generally evaluated from left to right. For multiple-table updates, there is no guarantee that assignments are carried out in any particular order.” Now, “generally” is quite vague and … Read more
Difference between i++ and (i)++ in C
i++ and (i)++ behave identically. C 2018 6.5.1 5 says: A parenthesized expression is a primary expression. Its type and value are identical to those of the unparenthesized expression. It is an lvalue, a function designator, or a void expression if the unparenthesized expression is, respectively, an lvalue, a function designator, or a void expression. … Read more
Bash: evaluate a mathematical term?
echo $(( 3+3 ))
Is ++x %= 10 well-defined in C++?
As per C++11 1.9 Program execution /15: Except where noted, evaluations of operands of individual operators and of subexpressions of individual expressions are unsequenced. If a side effect on a scalar object is unsequenced relative to either another side effect on the same scalar object or a value computation using the value of the same … Read more
What is the difference between quote and list?
TL;DR: They are different; use list when in doubt. A rule of thumb: use list whenever you want the arguments to be evaluated; quote “distributes” over its arguments, so ‘(+ 1 2) is like (list ‘+ ‘1 ‘2). You’ll end up with a symbol in your list, not a function. An in-depth look at list … Read more
In Java, what are the boolean “order of operations”?
The Java Tutorials has a list illustrating operator precedence. The equality operators will be evaluated first, then &&, then ||. Parentheses will be evaluated before anything else, so adding them can change the order. This is usually pretty much the same from language to language, but it’s always a good idea to double check. It’s … Read more
Evaluation & Calculate Top-N Accuracy: Top 1 and Top 5
Top-1 accuracy is the conventional accuracy: the model answer (the one with highest probability) must be exactly the expected answer. Top-5 accuracy means that any of your model 5 highest probability answers must match the expected answer. For instance, let’s say you’re applying machine learning to object recognition using a neural network. A picture of … Read more