Doubt in my code_pre increment and post increment without using arithmetic operator

Question

https://code.sololearn.com/c9WDtXR2X2j5
hi friends here is my code.....
i am getting wrong output for some inputs.
like for 3 ,7,11
why is it happening like that.....please correct the code if any errors.

Answer 1

Line 36: *x=*x^1; ==> *x=*x^m;

Answer 2

Thank you friend