Скачать или смотреть SEE QBASIC programming: Function Procedures Examples with dry run table[p-8.7.10]

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In this video, we dive deep into QBASIC programming for SEE Computer Science students. Learn the difference between local and global variables inside Sub and Function procedures. We explain concepts clearly with simple examples, helping you understand variable scope and improve your QBASIC skills for exams. Perfect for SEE students and beginners looking to master QBASIC logic!

✅ Perfect for SEE exam preparation
✅ Covers theory + practical examples
✅ Simple explanation for better understanding

Function procedure:
In QBASIC, Function is the type of modular programming techniques. They help divide a big program into smaller, manageable parts.
A Function is a reusable block of code that performs a specific task and returns a value.


Example programs and explanation
1.
DECLARE FUNCTION Square (N)
CLS
INPUT "Enter a number: ", N
PRINT "Square = "; Square(N)
END

FUNCTION Square (N)
Square = N * N
END FUNCTION

Example 2:

DECLARE FUNCTION Factorial(N)
CLS
PRINT "Factorial = "; Factorial(3)
END

FUNCTION Factorial(N)
F = 1
FOR I = 1 TO N
F = F * I
NEXT I
Factorial = F
END FUNCTION
dry run table:
| Step | N | I | F| Output|
| -------- | ------- | ----- | ----- | ----------------- |
| 1 | 3 | - | - | |
| 2 | 3 | - | 1 | |
| 3 | 3 | 1 | 1 | |
| 4 | 3 | 2 | 2 | |
| 5 | 3 | 3 | 6 | |
| 6 | 3 | - | 6 | *Factorial = 6* |

Example 3:
DECLARE FUNCTION IsEven(N)
CLS
INPUT "Enter a number: ", N
IF IsEven(N) = 1 THEN
PRINT "Even number"
ELSE
PRINT "Odd number"
END IF
END
FUNCTION IsEven(N)
IF N MOD 2 = 0 THEN
IsEven = 1
ELSE
IsEven = 0
END IF
END FUNCTION

Example 4
DECLARE FUNCTION Fibonacci% (N%)
CLS
INPUT "Enter term number: "; n%
PRINT "Fibonacci term "; n%; " = "; Fibonacci%(n%)
END
FUNCTION Fibonacci% (N%)
IF N% = 1 OR N% = 2 THEN
Fibonacci% = 1
ELSE
Fibonacci% = Fibonacci%(N% - 1) + Fibonacci%(N% - 2)
END IF
END FUNCTION

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