Question: Given the underneath fragment code that is written in C language, Write down the function with domain and codomain then prove that function is injective

Given the underneath fragment code that is written in C language, Write down the function with domain and codomain then prove that function is injective (One to one) but it's not surjective (Onto)? SHOW ALL YOUR WORKS, a counterexample is NOT ENOUGH, you have to disprove surjectivity and prove injective. void fun(int n.int *x.int *y )}{ *x=*n-7; *y=n+3;

please i do not have time

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