/in/foo.cc:9:18: error: 'x' has not been declared
 int getnum(int n,x){
                  ^
/in/foo.cc: In function 'int getnum(int, int)':
/in/foo.cc:12:12: error: 'x' was not declared in this scope
   if(n%10==x)
            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:2: error: 'cin' was not declared in this scope
  cin>>n>>x;
  ^~~
/in/foo.cc:27:2: error: 'cout' was not declared in this scope
  cout<<cot;
  ^~~~