Exercise #$1$: I need answr with c$++$Shalaby's calculator

Shalaby hates Math but loves calculators.

He has decided he will program his own calculator: It will only accept integers, and will even include a modulus!

The following is Shalaby's code:

#include $n1,n2n1n2chn1n+n2=nn1+n2n1n-n2n=nn1-n2n1n**n2n=nn1n2n1\frac{n}{}n2=nn\frac{1}{n}2$