' Generates Associated Magic Squares of order 4 for integers 1 thru 16

' Tested with Office 2007 under Windows 7

```Sub MgcSqr4b2()

Dim a(16), b(16), c(16)

y = MsgBox("Locked", vbCritical, "Routine MgcSqr4b2")
End

n2 = 0: n3 = 0: n9 = 0: k1 = 1: k2 = 1
m1 = 1: m2 = 16: s1 = 34

'   Generate data

t1 = Timer

For j16 = m1 To m2                                          'a(16)
If b(j16) = 0 Then b(j16) = j16: c(16) = j16 Else GoTo 160
a(16) = j16
For j15 = m1 To m2                                          'a(15)
If b(j15) = 0 Then b(j15) = j15: c(15) = j15 Else GoTo 150
a(15) = j15
For j14 = m1 To m2                                          'a(14)
If b(j14) = 0 Then b(j14) = j14: c(14) = j14 Else GoTo 140

j13 = s1 - j14 - j15 - j16
If j13 <= 0 Or j13 > 16 Then GoTo 130                       'a(13)
If b(j13) = 0 Then b(j13) = j13: c(13) = j13 Else GoTo 130
a(14) = j14
a(13) = j13

For j12 = m1 To m2                                          'a(12)
If b(j12) = 0 Then b(j12) = j12: c(12) = j12 Else GoTo 120
a(12) = j12

a(11) = s1 - a(12) - a(15) - a(16)
If a(11) <= 0 Or a(11) > 16 Then GoTo 110
a(10) = s1 - a(12) - a(14) - a(16)
If a(10) <= 0 Or a(10) > 16 Then GoTo 110
a(9) =  s1 - a(10) - a(11) - a(12)
If a(9) <= 0 Or a(9) > 16 Then GoTo 110
a(8) = 0.5 * s1 - a(9)
If a(8) <= 0 Or a(8) > 16 Then GoTo 110
a(7) = 0.5 * s1 - a(10)
If a(7) <= 0 Or a(7) > 16 Then GoTo 110
a(6) = 0.5 * s1 - a(11)
If a(6) <= 0 Or a(6) > 16 Then GoTo 110
a(5) = 0.5 * s1 - a(12)
If a(5) <= 0 Or a(5) > 16 Then GoTo 110
a(4) = 0.5 * s1 - a(13)
If a(4) <= 0 Or a(4) > 16 Then GoTo 110
a(3) = 0.5 * s1 - a(14)
If a(3) <= 0 Or a(3) > 16 Then GoTo 110
a(2) = 0.5 * s1 - a(15)
If a(2) <= 0 Or a(2) > 16 Then GoTo 110
a(1) = 0.5 * s1 - a(16)
If a(1) <= 0 Or a(1) > 16 Then GoTo 110

'                           Exclude solutions with identical numbers

GoSub 800: If fl1 = 0 Then GoTo 110

'                           n9 = n9 + 1: GoSub 640 'Print results (selected numbers)
n9 = n9 + 1: GoSub 650 'Print results (squares)

110 b(c(12)) = 0: c(12) = 0
120 Next j12

b(c(13)) = 0: c(13) = 0
130 b(c(14)) = 0: c(14) = 0
140 Next j14
b(c(15)) = 0: c(15) = 0
150 Next j15
b(c(16)) = 0: c(16) = 0
160 Next j16

t2 = Timer

t10 = Str(t2 - t1) + " sec., " + Str(n9) + " Solutions for sum" + Str(s1)
y = MsgBox(t10, 0, "Routine MgcSqr4b2")

End

'   Print results (selected numbers)

640 For i1 = 1 To 16
Cells(n9, i1).Value = a(i1)
Next i1

Return

'   Print results (squares)

650 n2 = n2 + 1
If n2 = 5 Then
n2 = 1: k1 = k1 + 5: k2 = 1
Else
If n9 > 1 Then k2 = k2 + 5
End If

Cells(k1, k2 + 1).Select
Cells(k1, k2 + 1).Font.Color = -4165632
Cells(k1, k2 + 1).Value = n9

i3 = 0
For i1 = 1 To 4
For i2 = 1 To 4
i3 = i3 + 1
Cells(k1 + i1, k2 + i2).Value = a(i3)
Next i2
Next i1

Return

'   Exclude solutions with identical numbers

800 fl1 = 1
For j1 = 1 To 16
a2 = a(j1)
For j2 = (1 + j1) To 16
If a2 = a(j2) Then fl1 = 0: GoTo 850
Next j2
Next j1
850 Return

End Sub
```