Functions in C Language

Answer 1

Functions have many uses. Although it is possible to write all code within a single function (the main function), code becomes harder to read. By separating the code into smaller, simpler functions with meaningful descriptive names, complex code becomes that much easier to both read and maintain. That is, the code becomes self-documenting so there is less need for comments which would otherwise become a distraction.

Each function should be designed such that it does the absolute minimum amount of work required to fulfil its purpose and does that work as efficiently as possible. Although functions can be expensive to call and return, a well-written function can be inline expanded by the compiler thus eliminating the function call altogether. Thus functions become a programming tool which can drastically reduce the amount of duplicate code we need to write.

Ideally, a function should be small enough so that all the code within that function will fit on screen at once. This usually means writing a huge number of low-level functions that do very little work by themselves, and then using these low-level functions as the building blocks for more complex, higher-level functions.

Answer 2

functions are a block of code that performs a specific task, a simple code that add two numbers can be a function

for e.g

void add_num(int a, int b)

{

printf("%d",a+b);

}

this is a small function which takes two numbers as parameters and prints the result of addition.

you can find more on functions here:

http://thetechnofreaks.com/2011/09/07/8-code-reusability-intrduction-to-functions/

Answer 3

This is a function.

int main (int argv, char **argc)

{

/*

** a whole lot of of C Programming code

*/

return 0;

};
functions are a block of code that performs a specific task, a simple code that add two numbers can be a function

for e.g

void add_num(int a, int b)

{

printf("%d",a+b);

}

this is a small function which takes two numbers as parameters and prints the result of addition.

you can find more on functions here:

http://thetechnofreaks.com/2011/09/07/8-code-reusability-intrduction-to-functions/

Answer 4

functions are used to reduce the length of program when same instructions has to be used again and again, it also break the program into module as well as it also improve the readability of the program ...

Answer 5

Instead of learning all such languges (like for commercial application we use cobol&for engineering and scientific application we use fotran etc... )why can't we use one language i.e., 'c' so Dennis ritchie developed 'c' language.

Answer 6

Functions help modularise code. They usually contain code that is repeatedly executed. Using functions helps improve program readability and ease of maintenance.

Answer 7

a subroutine that returns a value (other than void)

or a subroutine that doesn't (exit is an example)