FUNCTIONS

What are functions? Explain the types of functions in detail with an example program for each type.

A function is a self contained block or a sub program of one or more statements that performs a special task when called.
Types:
· Library Functions
· User Defined functions
(a) Function Declaration
returntype function-name(Parameters);
Example:
int square(int, int);
(b) Function calling
function-name(actual parameters);
Example:
int square(a,b);

(c) Function Definition:
returntype function-name(formal parameters)
{
}

Example:
local variable declaration;
statement 1; statement 2; return(value);
void square(int a, int b)
{
printf(“%d”,(a*b));
}
Example for functions:
· Addition of two numbers where addition is a separate function
· Program using function for evaluating Fibonacci series.