BMI calc

main.cpp

#include <iostream>
#include <string>
#include <cstring>
#include <sstream>
#include <iomanip> 
using namespace std;

// 
typedef struct{
  double bmiValue;
  int category;
}BMI;

typedef struct {
string name;
int age;
double weight;
double height;
BMI bmi;
}Student;

//array of student
Student students[30];
int option=0, lastIndex =-1;
string categories[7]= {"Under Weight", "Normal Weight", "Over Weight", "Obese", "Severely Obese", "Morbidly Obese", "Super Obese"};

// function prototype
BMI calculateBMI( double , double );
int getCategory(double);
void showMenu();
void printData();

int main() {
  do showMenu();
 while(option >=1 && option <=2);

 cout<<"Invalid option... programme terminated";
}

void showMenu(){
  option = 0;
  cout<<"\n\nStudent BMI Calc"<<endl;
  cout<<"\t 1. Add a student\n\t 2. Print student records"<<endl;
cout<<"Enter your option: "; cin>>option;
 if (option == 1){
    Student newStudent;
    cout<<"Enter the student's name: "; cin>> newStudent.name;
    cout<<"Enter the student's age: "; cin>> newStudent.age;
  if(newStudent.age>=18){
    cout<<"Enter the student's height: "; cin>> newStudent.height;
    cout<<"Enter the student's weight: "; cin>> newStudent.weight;
      newStudent.bmi = calculateBMI(newStudent.weight, newStudent.height);
  }
      lastIndex +=1;
 students[lastIndex] = newStudent;
    
    cout<<"New student "<<students[lastIndex].name<<" has been added.... bmi: "<<students[lastIndex].bmi.bmiValue<<", category: "<<categories[students[lastIndex].bmi.category]<<endl;
  } else if (option == 2){
   printData();
  }
}

BMI calculateBMI( double weight, double height){
  BMI bmi;
  bmi.bmiValue = weight/ (height*height);
  bmi.category = getCategory(bmi.bmiValue);
return bmi;
}

int getCategory(double bmiVal)
{
         if(bmiVal <= 18.4 ) return 0;
           else if(bmiVal >= 18.5 && bmiVal<= 24.9) return 1;
           else if(bmiVal >= 25.0 && bmiVal<= 29.9) return 2;
           else if(bmiVal >= 30.0 && bmiVal<= 34.9) return 3;
           else if(bmiVal >= 35.0 && bmiVal<= 39.9) return 4;
           else if(bmiVal >= 40.0 && bmiVal<= 49.9) return 5;
           else return 6;
         }
//Print Results
void printData(){
  int aboveCount,belowCount;
    stringstream studentsAbove, studentsBelow;
    lastIndex += 1;
cout<<"Printing out "<<lastIndex<<" stdent records"<<endl;
  
    for(int i=0; i<lastIndex; i++){
      if(students[i].age>=18) {
        aboveCount+=1;
        int catIndex = students[i].bmi.category;
        studentsAbove << setw(20) << left <<students[i].name<< setw(8) << left <<students[i].age<<setw(8) << left <<students[i].height<<setw(8) << left <<students[i].weight<<setw(8) << left <<students[i].bmi.bmiValue<<setw(30)<<left<<categories[catIndex]<<endl;}
        else{
          belowCount+=1;
          studentsBelow << setw(20) << left <<students[i].name<< setw(8) << left <<students[i].age<<endl;
        }
    }
    cout<<"\n\nSTUENT UNDER 18:  "<<belowCount<<"\n************************************************\n"<<setw(20) << left<< "Name"<<setw(8) << left <<"Age\n************************************************"<<endl;
     cout<<studentsBelow.str()<<"\n************************************************"<<endl;

   
     
     cout<<"\n\nSTUDENTS ABOVE 18: "<<aboveCount<<"\n******************************************************************\n"<<setw(20) << left<< "Name"<<setw(8) << left <<"Age"<<setw(8) << left <<"Height"<<setw(8) << left<<"Weight"<<setw(8) << left <<"BMI"<<setw(30)<<left<<"BMI Category"<<"\n******************************************************************"<<endl;
     cout<<studentsAbove.str()<<"\n******************************************************************"<<endl;
         lastIndex -= 1;

}