I cannot understand what is the difference between:
#define WIDTH 10
and
int width = 10;
What are the benefits of using the first or the second?
I cannot understand what is the difference between: #define WIDTH 10 and int width
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I cannot understand what is the difference between:
#define WIDTH 10
and
int width = 10;
What are the benefits of using the first or the second?
Well, there is a great difference. You can change the value of
width, you can take its address, you can ask for its size and so on. WithWIDTH, it will be just replaced with a constant10everywhere, so the expression++WIDTHdoesn’t make any sense. Ono the other side, you can declare an array withWIDTHitems, whereas you cannot declare an array withwidthitems.Summing it up: the value of
WIDTHis known at compile time and cannot be changed. The compiler doesn’t allocate memory forWIDTH. On the contrary,widthis a variable with initial value 10, its further values are not known at compile time; the variable gets its memory from the compiler.