Doubt in the compilation error

#1

please check my code and tell the reason for error

#2

@Adhyayan,
Please share your code with me.

#3
#4

@Adhyayan.
I have corrected your code: https://ide.codingblocks.com/s/207913
There were errors in reverse method. I have commented the errors and corrected them, kindly have a look.

#5

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