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#include <iostream>
using namespace std;
 
struct InputNum {
 private:
  const int input;
 
 public:
  InputNum(const int num) : input(num){};
 
  int get() const
  {
    return input;
  }
  bool greater_than(const int target) const
  {
    return input > target;
  }
  bool less_than(const int target) const
  {
    return input < target;
  }
  bool equals(const int target)
  {
    return input == target;
  }
};
 
void func(const InputNum &num)
{
  num.equals(1);
  num.less_than(1);
}
 

prog.cpp: In function ‘void func(const InputNum&)’:
prog.cpp:31:15: error: passing ‘const InputNum’ as ‘this’ argument discards qualifiers [-fpermissive]
   num.equals(1);
               ^
prog.cpp:23:8: note:   in call to ‘bool InputNum::equals(int)’
   bool equals(const int target)
        ^~~~~~

Standard output is empty