In our life, we need to perform tasks which are repetitive in nature in numerous applications. It is a tedious process to perform such kind of tasks repeatedly with pen/pencil and paper. But with computer programming languages and packages, the task becomes easy, accurate and fast. For example, salary of labours of a factory can be calculated simply by a formula (number of hours work carried × wage rate per hour). The accounts department of every organization does this calculation every month/week. Such ...