Bjarne Stroustrup wrote me:. I don't remember any deep thoughts or involved discussions about the order at the time. Member functions should be marked const if and only if it is garanteed that by calling them the object is not changed. Trying to use const for class member functions for other reasons is wrong.
Because the given class allows to change a constant object A we can conclude that the design of the class is wrong. The following example is correct and shows how to use const for member functions for overloading purposes. One of the common ways to define constants in C is to use the define preprocessor directive, as shown below:.
In C, the preprocessors process the source code ahead of compilation to produce the expanded source code. This is illustrated below. It's a good practice to include the definition of all constants after the header files in your program, as shown below:.
And it will compile and execute without errors. Depending on your compiler, you may get a warning that you're trying to redefine an already-defined constant. So you now know that the define constants are in some sense not true constants as you can always redefine them. The const qualifier makes the variable read-only.
Like Article. Here i. And p is of type. The type of. The type of expression. The reason being, const qualified identifiers. Previous Understanding "volatile" qualifier in C Set 2 Examples. Next Initialization of static variables in C.
Recommended Articles. Article Contributed By :. The above declaration described that constant pointer is pointing to a constant integer variable. It means we cannot change value pointed by the pointer as well as we cannot point the pointer to other integer variables.
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