It is easy to see how a program flows. For example, where does following one path, as opposed to another, take the program? Flowcharts follow an international standard - it is easy for any flowchart ...

find out how old the person is if the person is younger than 15 then say “You are eligible for a discount ticket.” otherwise, say “You are not eligible for a discount ticket.” OUTPUT "How old are you?

Computer System Components: Input and Output Devices, Memory and Storage Devices, Block diagram of Computer System, Types of Software, Operating System with its types, Compiler, Interpreter, Assembler ...