Fundamentals of QBASIC

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QBASIC stands for 'Quick Beginners All-purpose Symbolic Instruction Code'. It is a simple programming language developed for beginners to write and run computer programs easily.

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QBASIC was developed by Bill Gates and Paul Allen in 1975. It was created to make programming easier for beginners using microcomputers.

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QBASIC is user-friendly, has simple grammar, provides a clear screen for writing programs, and allows easy debugging. It also supports helpful commands like CLS, RUN, and PRINT that make learning fun …

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The two main screens in QBASIC are: (1) Program Screen – where you write your code, and (2) Output Screen – where the result of your program appears after running it.

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A statement is an instruction given in a program. Statements are the building blocks of any QBASIC program. Examples include PRINT, LET, and END statements.

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The LET statement assigns a value to a variable. For example: LET A = 10 means the variable A now holds the number 10. The word 'LET' is optional – you can also write A = 10.

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A constant is a value that does not change during program execution. There are two types: Numeric constants (like 25, -10) and String constants (like "Hello", "Class 5") enclosed in double quotes.

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A variable is a named storage location that holds a value which can change during program execution. For example: A = 5 or Name$ = "Ravi". Variables can be numeric (A, B) or string (A$, B$).