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Computing Academy GCSE Computer Science

Complied programs will

Complied programs will only run on the computer system that they were designed for as the process of compiling generates CPU specific machine code. If you compile a program to work on a particular CPU using a particular instruction set, it won’t run on other CPUs with different instruction sets. Interpreters Interpreters take one high-level line of code at a time, translate it into machine code and run it before fetching and translating the next. Developers love interpreted languages as it’s much easier to find bugs when coding. They can keep running their programs and once an error is found, the developer can fix it and run the program again to find the next bug. Interpreters need to translate programs line by line while the program is running which can slow down the running of a program and will take up more memory (RAM). As interpreted programs are translated at runtime (when you launch the program because you want to use it - the translation happens), they are portable. No machine code is created in advance so the program can usually run on a range of different CPUs; the interpreter will then translate the program using the correct instruction set while the program executes. Compiler The whole program is translated before execution The compiled program does not need the original source code so this prevents reverse engineering The program runs faster as memory and CPU power is not being used for translation Errors for the entire program are generated at the same time making debugging harder Program is translated for a particular CPU, so once compiled it will not work on other types of CPU. Interpreter Each line of code is translated one by one while the program runs The program is not compiled before distribution or sale, therefore the source code is easier to reverse engineer. Translation happens as the program runs which can make the program run slower Easier for developers during debugging as one line of code is executed at once Can run on most computer systems as the program is translated each time for that particular CPU 173

The Basics Print Statement Computers are defined as being systems that take inputs, process the data and generate outputs. We need outputs in order to understand what a computer system is doing so that we can interact with it. In Python, the print statement is used to output data and display this on the screen. The print statement does not send anything to your printer. 174

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