What is the difference between #define and constant?

Things defined by #define are replaced by the preprocessor before compilation begins. const variables are actual variables like other normal variables. We can also have pointers to const variables, we can pass them around, typecast them, and any other thing that can be done with a normal variable.

What is the function of typedef?

typedef is a reserved keyword in the programming languages C and C++. It is used to create an additional name (alias) for another data type, but does not create a new type, except in the obscure case of a qualified typedef of an array type where the typedef qualifiers are transferred to the array element type.

What is #define used for in C?

In the C Programming Language, the #define directive allows the definition of macros within your source code. These macro definitions allow constant values to be declared for use throughout your code. You generally use this syntax when creating constants that represent numbers, strings or expressions.

Is it different from or different than?

In formal writing, different from is generally preferred to different than. This preference has to do, in part, with the historical use of the word than. This term entered English as a conjunction often used with comparative adjectives, such as better, taller, shorter, warmer, lesser, and more, to introduce the second element in a comparison.

What does different mean?

Different(adj) distinct; separate; not the same; other. Different(adj) of various or contrary nature, form, or quality; partially or totally unlike; dissimilar; as, different kinds of food or drink; different states of health; different shapes; different degrees of excellence.

What is the adjective for difference?

differentiating, distinguishing, discriminating, discerning, identifying, recognising, recognizing, contrasting, determining, differencing, secerning, understanding, antithesising, antithesizing, beholding, catching, comprehending, detecting, digging, marking, noting, noticing, observing, seeing, sighting, spotting, telling, discerning a difference, drawing a distinction, seeing a difference, telling apart, telling the difference, making a distinction, splitting hairs, making out, picking