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Macros are processed at preprocessing time where as constant variables are processed at complie time. Macros doesnot have any scope but constant variables has scope. Macros doesnot have the type checking where as constant variables have type checking.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoprogram veriable is a simple veriable of any program its value can be change or modify in future but if we have any constant in our program we cannot change its value we can only use it in increment & decrement and contatant value(fixed value)
e.g : if we have two variable a and b a is constant and b is simple variable
we can use like that:
constant int a=10;
int b=20;
we can change b's value like b=30;
Not like that a=20; its will give error in you program
we can increment or decrement it like a++;a--;
not have other difference b/w them
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What are the differences between a global variable and macro?
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What is the expansion of conio.h?
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