Qbasic Tutorial for beginners and children (Under Construction)


Solving Mathematical Problems (Part 2)

As we say:   Practice makes perfect.  Here are more examples:

Example 2

Write a program that will display the product of numbers 8 and 12

Algorithm Program Code

Get the first number

Get the second number

Calculate the sum

Write down the result

number1 = 8

number2 = 12

sum = Number1 + Number2

PRINT sum

Be careful about not naming variables after BASIC reserved words. In the example below, you might be tempted to use the word "base" for to store the base of the triangle. The word "BASE" cannot be used. It is a reserved word in BASIC

Example 3

Write a program that will calculate the area of a triangle of base = 10 and height = 5

Algorithm Program Code

Get the base

Get the height

Calculate the area

Write down the area

'The word BASE is reserved in BASIC

'So we'll use variable tbase to store the base

tbase = 10

height = 5

area = 1/2 * tbase * height

PRINT area

As it is the case in mathematics, operations in BASIC follows the BODMAS (Bracket, Of, Division, Multiplication, Addition, Subtraction) sequence. In the example below, BASIC will calculate the sum of the length and breadth within brackets then multiply it by 2.

Example 4

Write a program that will calculate the perimeter of rectangle of Length = 20 and breadth = 8.

Algorithm Program Code

Get the length

Get the breadth

Calculate the area

Write down the area

length = 20

breadth = 8

area = 2 * (length + breadth)

PRINT area

There may be several ways to process a task in BASIC. Use the one that suits you better.

Example 5 (method 1)

Write a program that will calculate the area of a circle of radius = 7.

Algorithm Program Code

Get radius

Get pi

Calculate the area

Write down the area

radius = 7

pi = 22/7

area = pi * radius * radius

PRINT area

 

Example 5 (method 2)

Write a program that will calculate the area of a circle of radius = 7.

Algorithm Program Code

Get radius

Get pi

Calculate the area

Write down the area

radius = 7

pi = 22/7

area = pi * (radius ^ 2)

PRINT area

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