[SOLVED] Modulus Function

Hey there,

I had a quick search but couldnt find what i was looking for, basically im looking to use the mathematical modulus of a function in excel, however whenever i search i keep finding the MOD() function which isnt what im looking for (i dont think)...

I have a formula and in it is a square root, i want the formula inside the square root always to be positive so i get a result.

Example:

(A1)
-1
(A2)
0
(A3)
-2

(C1)
=(A1)^0.25
(C2)
=(A2)^0.25
(C3)
=(A3)^0.25

Now i only get a result from the last two, but i want to use the modulus function so that instead of a maths error i get 1 for the first one, how do i do this?

Thanks,

Max