Functions are the building blocks of C. All programs definitely consist of one function - main() - and inevitably refer to, or, in programming terminology, call or invoke standard functions of C such as printf(), scanf(), etc. as well as user-defined functions.
Advantages of Functions
Besides the obvious advantages of
-> Reusability, and
-> Structing of programs
functions also provide programmers a convenient way of designing programs in which complex computations can be built into the functions. Once properly designed, a programmer does not have to bother about how the calculations are done in the function; it is sufficient for him to know what it does. Thus, to the programmer, the function itself would be like a black box. The programmer has to the function.
The use of functions would probably save a programmer the often nerve-racking experience of debugging a program that refuses to 'function' properly.
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