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In our day to day life in numerous applications we need to perform tasks that are repetitive in nature. It is a tedious process to perform such a kind of task repeatedly with pen/pencil and paper. But with computer programming languages and packages, the task becomes easy, accurate and fast. For example, the salary of laborers of a factory can be calculated by a formula (number of hours worked × wage rate per hour). The accounts department of each organization is involved in performing this type of calculation every month/week. Such a type of repetitive deeds can be easily done using a loop or iterative structure in a program.

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