First, use camelCase for naming in Swift. lowerCamelCase for constants/variables/functions and UpperCamelCase for types (classes, …) MAX_RADIUS_IN_MILE -> maxRadiusInMile Now to your problem. Error is clear, you have constant of type Double (if you don’t specify type of decimal number, compiler give it type Double), but assigning maximumValue requires type Float. What now? One solution … Read more
I can see why you’re having trouble with this pointer variable: it isn’t one. It is a reference. You cannot have a non-const reference to a const thing. That would violate the const, and allow the n = 11 line to succeed, thus again violating the original const. const means “I cannot and will not … Read more
Creating a reference (&) allows the value to be modified (bad), but saves the compiler making a copy of the object (good). Making a reference constant, stops the value from being modified. So const someType & value as a parameter saves a copy and tries to give non-modification promises to the caller. solved Why we … Read more
Simply use a new local variable inside your reading loop like this: while(stream >> token) { if(token == “#define”) { constantVariable addconstant; stream >> token; addconstant.constantName = token; stream >> token; addconstant.constantValue = token; constant.push_back(addconstant); } } But take care with checking the input stream. It should not be done as easy as you did … Read more
It is certainly undefined behavior, but I am strong proponent of understanding symptoms of undefined behavior for the benefit of spotting one. The results observed can be explained in following manner: const int a = 5 defined integer constant. Compiler now assumes that value will never be modified for the duration of the whole function, … Read more
The first parameter to fputs is a char*, so the code you show is obviously incorrect. You say I tried itoa or sstream functions but it’s not working. but those are the solutions, and there’s no reason for them not to work. int a = 5; //the C way FILE* pFile = fopen(“myfile.txt”,”w”); char buffer[12]; … Read more
The code given looks OK, but if you want the sum without including the last number, as is generally the case you should change the for loop like this for(; index < endno; index ++) solved Sum of the all the numbers between a and b [closed]
Non-exhaustive list of reasons: Software Engineering (SWE). SWE is not just programming, but programming with other people and over time. const allows to explicitly express an invariant, which lets you and others reason about the code. As the program becomes bigger, these invariants cannot be just memorized. That’s why encoding them in the programming language … Read more
In general, returning a reference avoids that the return value gets copied, and (if it is not const-qualified) gives you the opportunity to change the “original” value. A return type const T& is often used in conjunction with objects of class type, e.g. std::vector, where copying could result in (unwanted) overhead. In conjunction with elementary … Read more
Here’s the most const example: class Foo { const int * const get() const {return 0;} \_______/ \___/ \___/ | | ^-this means that the function can be called on a const object | ^-this means that the pointer that is returned is const itself ^-this means that the pointer returned points to a const … Read more
Yes, they are hexidecimal numbers. The case of the x will not make a difference. You are correct, the methods that are public can be called from outside of the class. 2 solved What decimal value does some hexadecimal constant have in Android [closed]
As has been explained, your ERROR_SW is a constant, and may not contain run-time variables If you intended $switch_ip and $timeout to also be constant values then, because use constant is evaluated at compile time, you would also have to declare and define these two variables beforehand. Like this use strict; use warnings ‘all’; my … Read more
A variable, as the name implies, varies over time. Variables mostly allocate memory. In your code, when you declare that a value will not change, the compiler can do a series of optimizations (no space is allocated for constants on stack) and this is the foremost advantage of Constants. Update You may ask why do … Read more
You should use a typedef so that you don’t have to use any awful syntax: using matrix_t = int[3][3]; And you should pass your args by reference whenever possible: void handle_matrix(const matrix_t &mat){ // do something with ‘mat’ } If you want to use the original syntax without a typedef: void handle_matrix(const int (&mat)[3][3]){ // … Read more
It is completely up to the implementation. For example, const data on bare metal ARM uCs is stored in the FLASH memory. You can write to there but it will have no effect at all. Hosted systems will behave differently depending on the OS, its version and hardware. How can I overwrite a const block … Read more