Visual Basic 2005 for Programmers: Deitel Developer Series, Second Edition

7.4. Functions: Methods That Return a Value

Functions (known as Function procedures in earlier versions of Visual Basic) are methods that return a value to the caller (whereas subroutines do not). The console application in Fig. 7.2 uses the function Square to calculate the squares of the integers from 1–10.

Figure 7.2. Function for squaring an integer.

1 ' Fig. 7.2: SquareInteger.vb 2 ' Function that squares a number. 3 Module SquareInteger 4 Sub Main() 5 Console.WriteLine("Number" & vbTab & "Square") 6 7 ' square integers from 1 to 10 8 For counter As Integer = 1 To 10 9 Console.WriteLine(counter & vbTab & Square(counter)) 10 Next 11 End Sub ' Main 12 13 ' function Square is executed when it is explicitly called 14 Function Square(ByVal y ...