Excel: Using minus minus to convert a boolean value to 0 or 1
When involved in a mathematical expression, TRUE is considered to be 1 and FALSE to be 0.
Thus, boolean values can be turned into numerical representation by using minus (-) twice on the boolean value.
In the following example, the VBA code inserts a few boolean values into the first column and then inserts a formula with two minus signs to represent the boolean value as 0 or 1:
option explicit
sub main() ' {
'
' Clear active sheet's data:
'
activeSheet.usedRange.clearContents
'
' Fill some boolean values into the first column:
'
cells(1,1) = false
cells(2,1) = true
cells(3,1) = true
cells(4,1) = false
cells(5,1) = true
'
' Use dash-dash (or minus minus) to turn boolean values into 0 and 1 in
' second column:
'
range(cells(1,2), cells(5, 2)).formulaR1C1 = "= -- rc[-1]"
end sub ' }
