//Lab #15
				//from Maksim Ivanenko
				//for IT 340
				//due by 06-15-01

	#include <iostream.h>
	#include <fstream.h>
	#include <math.h>

	struct record
	{
		short number;
		float square;
		float root;
	};//end of structure declaration

	void main()
	{
		//variable daclaration
		record even[5];
		short test;
		ofstream outfile;
		ifstream infile;
		outfile.open("Lab15.dat");
		for (short i=0;i<5;i++)//to assign array of 5 elements 
		{
		for (short k=1;k<6;k++)//to assign even numbers from 2 to 10
		{
			even[i].number=k*2;
			even[i].square=(float)pow(k*2,2);
			even[i].root=(float)sqrt(k*2);
			outfile<<even[i].number<<"   "<<even[i].square<<"   "<<even[i].root<<endl;
		}//end of inner for loop
		}//end of outer for loop
		outfile.close();

			cout<<"Enter number: ";
			cin>>test;
			cout<<"________________________________________________"<<endl;
		while(test!=0)
		{
		infile.open("Lab15.dat");
		for (short j=0;j<5;j++)
		{
			infile>>even[j].number>>even[j].square>>even[j].root;
			if (test==even[j].number)
			{
			cout<<"Square of number "<<even[j].number<<" is "<<even[j].square<<endl;
			cout<<"Square root of number "<<even[j].number<<" is "<<even[j].root<<endl;
			}
		}//end of for loop
		infile.close();
			cout<<"To exit enter 0, to continue enter any number ";
			cin>>test;
			cout<<"________________________________________________"<<endl;
		}
	}//end of main

	//test run results
	/*
	Enter number: 4
	________________________________________________
	Square of number 4 is 16
	Square root of number 4 is 2
	To exit enter 0, to continue enter any number 9
	________________________________________________
	To exit enter 0, to continue enter any number 6
	________________________________________________
	Square of number 6 is 36
	Square root of number 6 is 2.44949
	To exit enter 0, to continue enter any number 2
	________________________________________________
	Square of number 2 is 4
	Square root of number 2 is 1.41421
	To exit enter 0, to continue enter any number 0
	________________________________________________
	Press any key to continue
	*/