main.cpp
#include "person.h"
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main() {

	CPerson ivan("Ivan Ivanov",190,70);
	ivan.print();
	ivan.printBMIStatus();
	return 0;
}
person.h
#ifndef _PERSON_H
#define _PERSON_H

class CPerson {
public:
	CPerson(const char*, unsigned short, unsigned);
	~CPerson();

	//setters
	void setHcm(unsigned short);
	void setWkg(unsigned);

	//getters
	const char * getName()const;
	unsigned short getHcm()const;
	unsigned getWkg()const;

	void print()const;
	double bmi()const;
	void printBMIStatus()const;

private:
	const char * name;
	unsigned short hcm;
	unsigned wkg;
};

#endif
person.cpp
#include "person.h"
#include <iostream>

CPerson::CPerson(const char* name, unsigned short hcm, unsigned wkg){
	this->name = name;
	this->hcm = hcm;
	this->wkg = wkg;
}
CPerson::~CPerson(){
}

//setters
void CPerson::setHcm(unsigned short h){
	hcm = h;
}
void CPerson::setWkg(unsigned wkg){
	this->wkg = wkg;
}

//getters
const char * CPerson::getName()const{
	return name;
}
unsigned short CPerson::getHcm()const{
	return hcm;
}
unsigned CPerson::getWkg()const{
	return wkg;
}

void CPerson::print()const{
	std::cout << "Person\'s name is " << name << std::endl;
	std::cout << "Person\'s height is " << hcm << std::endl;
	std::cout << "Person\'s weight is " <<  wkg << std::endl;
}
double CPerson::bmi()const{
	double t = 0.01*hcm;
	t *= t;
	return wkg / t;
}
void CPerson::printBMIStatus()const{
	double tmp = bmi();
	if (tmp < 16) {
		std::cout << "Severely underweight\n";
		return;
	}
	if (tmp > 16 && tmp <18.5) {
		std::cout << "Underweight\n";
		return;
	}
}