Explain the working

Question

i wrote a code in java and it is producing unexpected output
the very first characters produced were my reaction during the execution of program

https://code.sololearn.com/cmVarHpQJey0/?ref=app

Answer 1

When you add the chars you make a sum of their ascii code and in the loop you increment the ascii code. If you want to concatenate the chars you should use java.lang.String instead of char

Answer 2

the only character that is reappearing is '?'. Probably because the program doesn't known what to print

Answer 3

thanks bodgan

Answer 4

but there are multiple similar characters , why?

Answer 5

@bodgan
tnx