Page 2 - Sample_test_Float

Chapter 4

Functions and Pointers

5.1. Functions – User Defined Functions

Real Time Examples
• We have got various functions in our body for doing specific tasks.
◦ Heart for pumping blood in veins
◦ Lungs for breathing
◦ Eyes for vision
◦ Legs for walking
◦ Nose for smell
Solutions
Similarly in programming we need something to handle our repetitive or specific task that is called function.
A function
i) accepts some input
ii) processes it
iii) produces output.

Function Concept in Mathematics
f(x) = 5x – 3

where
f is a function name
x is an argument or input of a function
5x-3 is a definition of a function.
When x = 1,
f(1) = 5(1) – 3
f(1) = 2
2 is the return value of the function.

When x=2,
f(2) = 5(2) – 3
f(2) = 7
7 is the return value of the function.
So, every function must have name, argument (input) and return (output) type.

2 Functions and Pointers