Tutorial qbasic pdf

It helps to find the sum of all values assigned to the particular variable. The process of a departure of the control of the program Conditionally or Unconditionally from its sequential flow depending upon the result of the condition is known as Branching or Jumping. Control Structure is the statement of the structure that is used to handle different condition and iteration. It is used to control the flow of a program. A structure in which the statements are executed sequentially one after another without changing the flow of the program.

It is also known as a branching structure that allows you to transfer the program control from one part to another on the basis of a specified condition or without condition. This is a decision-making statement that decides which statement has to be executed on the basis of the specified condition. It is a one-way decision-making statement that evaluates a condition and executes the statement if the result of the condition is true. It is the two-way decision-making statement that can decide which part of the computer it has executed when the condition is true or false.

It executes one part of a program if the condition is true and another part if the condition is not true or false. It is a multi-way decision-making statement that is used when there are two or more conditions to be evaluated. It executes a block of statements repeatedly until the specified condition is true.

It repeats a part of the program while a condition is true or until the condition becomes true. The Loop inside the loop structure is called Nested loop.

It contains an outer loop and inner loop. September 1, Last Updated: September 1, 2, 5 minutes read. Then how to put all that you've learned to good use. QB Cult Magazine 1. QB Cult Magazine 3. Clearing the screen and printing the results of math equations to the screen.

Programming for Fun -- this tutorial starts at the beginning, with PRINT, and moves on over topics like making text blink, timed pauses and whole lot more. This tutorial series covers a ton of different commands and concepts, including many that are overlooked by other tutorial series, but this is not organized very well.

Covers variables, subroutines and how to make your own "Henry The Eighth" poem. Includes many simple programming tasks to get you to apply what you've learned.

Formatting text, simple graphics commands, making musics, manipulating numbers, date and time, random numbers and a whole lot more. This tutorial will give theory and code about making a tile-based RPG from scratch. Submitted by Halifax on October 31, QBasic BootCamp. QBasic Bootcamp. This is a tutorial set that assumes the worst It then takes you from nothing to very advanced topics such as assembly, mouse handling, libraries, etc.

Very easy to use and easy to understand. Large examples and extremely detailed. Possibly some of the best tutorials you could find on the web! It obviously is the end of the program.

If there happens to be more program lines after the END command, they are not executed, because END tells the computer to stop. Simple, really, Now we need to tell the computer that we want this program to run. How do we do that? Take a look at the very bottom of the screen. Notice that it tells us that the F5 key is a shortcut key to run the program. Go ahead and press F5 to run it.

Oh, look! You get a 42 as a result. Can you figure out why? Add the three up, and you get Now it is your turn to write a few programs. Then from the pulldown menu, select New either with the mouse by clicking on it or the keyboard by pressing N.

You will get a box asking if you want to save the changes. We really don't need to save this, so answer No. You will then be presented with a clean slate. The CLS will clear any previous QBasic codes output and start a new fresh execution but not terminating the execution of such programming. Chapter Two Variable and Data Type Hi, before we get into the variable and data type and some other stuff that this chapter will entails, let us look at a glance some of the QBasic basic syntax and procedures, i.

The form of a QBasic Code i. Each of QBasic statement must be on a line ii. Each statement must be proceeded by a number referred to as the line number iii. Line numbers must be positive and a whole number iv.

Variable is a name of a location in the computer memory where a number or a string is stored. In other words, variable hold information. Note that the name of a variable is called an identifier i. Variables in QBasic can be classified into two groups i. Numerical variables ii. String variables Let us look into this type of numerical variables i. Numerical : A numerical variable consists of digits.

Two types of numerical variables commonly used in QBasic are Integers and Single-precision numbers. An integer numerical variable has no decimal points. If the last character in the variable name is! Is a single — precision variable. String: A string variable is the name of a location or store in the computer memory where a string data or values are stored. In QBasic, here are some of the rules that govern the formation of variable name. All variable names must start with a letter of the alphabet from A to Z b.

No special symbols or characters or QBasic keywords must be used as variable name. If more than one variable is used in a program, each variable name must be different i. Upper and lower case are different variable name. Example variable name MyName is different from variable name myname. Variable names should be kept short and meaningful so as to remember what they hold or represent.

For example: age, amount, salary, tax, weight, height, bonus e. These kind of variables names should be avoided a, b, c, d, x, y, z. This is because it does not convey a meaningful variable name for others who will need to read your codes. QBasic Data Type One of the keys to a successful and enjoyable programming experience is a thorough understanding of data types. Programming is associated with manipulation of data. The data comes in different types, QBasic does not have too many data types.

We have tried to explain a few data type that will be most often used by QBasic programmers. The range of values that the integer variable can hold is relatively small , to 32, Examples of integer variable i. Examples of Long Integers: i. Just like integers that have two types, also, number with decimal points have two variable types.

The least accurate is called single precision. They are accurate to only seven digits. To make sure that a variable holds only single precision values, the exclamation mark symbol! Example of Single Precision Variables i.

Double precision variables are mainly used in scientific calculations. To force double precision on a variable, a hash symbol is added to the back of the variable name. Examples of Double Precision Variables i. The QBasic will assume the programmer means The computations or data manipulation involving double precision data types are often slower than those requiring integer data types.

A value is constant if its value will not change in the course of programming executions. Think of value of PI i. Declare a variable name that will hold an integer values, string values and long integer values. What is the difference between integer and single precision variable declaration in QBasic programming language. How do we declare a constant value? Differentiate between variable and an identifier. QBasic Commenting Comment in QBasic simply means that a particular or series of line of codes that QBasic compiler will not execute but are used to explain the purpose of such line of code segment.