[?] Set a function with conditions?

Questions
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1

The problem is :
Use conditions to give a function pow[x_,r_]. Be sure to use the string “imaginary”, and to test your result on pow[0,0], pow[2,0], pow[2,2], pow[-1,1/3], pow[-1,1/2], and pow[-1, [Pi]].
I’m unsure how to set it up to correctly for example, when I try pow[x_, r_] := “undefined” /; x = 0 && r = 0, it gives me 0 instead of undefined as the output

2

Use == for testing if something is “equal”. A single equal is “Set”. You will need to quit your kernel because you assigned a value to x and r.

3

Thank you so much ! It worked after I used ==