How can I randomly assign addition or subtraction in a for loop?

[mcg123]

Does anyone have any ideas for how I can randomly assign a for loop to add or subtract random numbers throughout various itterations?  My current code generates two random numbers and adds them together for a set number of itterations.  I need some random itterations to be subtraction.  Thanks in advance!  

[Taki1999 · Accepted solution]

Add another Random Number generator and compare the result against 0.5. Use a case structure around your addition/subtraction operator.

Seems like you might also want to output which operation actually got picked.

[mcg123]

Works great! Thank you.