Computers were invented to do repetitive computations in a short time with great accuracy. People then put computers to better use by developing programming languages; using a programming language, a programmer could write a set of instructions for the computer to perform. This way, it was possible to make the computer perform different tasks. For example, one could write a set of instructions to compute the monthly salary and tax deductions of an employee, or calculate the total amount of electricity bill on the basis of the number of units consumed. Later, many programming languages were developed to make computers more efficient.
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