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Computing Academy GCSE Computer Science

taxdue = profit *

taxdue = profit * taxrate print(taxdue) 1000 In this example, we could have just used 0.20 in the place on the constant taxrate, but by declaring the constant at the beginning of the program and using it throughout a program, should the rate of tax change, we’d only need to modify the constant at the beginning of the program rather than working through many lines of code looking for every occurrence of 0.20. 181

Data Types What Are Datatypes? Data comes in many different varieties and the computer needs to know which type of data it is working with. This allows the computer to ensure enough space is reserved in memory for the variable or constant you need to store. Python automatically recognises and assigns a datatype but some programming languages do not as you will see in the following examples. 182

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