#include<stdio.h>
#include<conio.h>
int hcfactor(int x,int y)
{
	if(y==0)
	return x;
	else
	return hcfactor(y,x%y);
}
void main()
{
	int a,b,f;
	printf("Enter two numbers:\n");
	scanf("%d%d",&a,&b);
	f=hcfactor(a,b);
	printf("HCF of %d and %d is %d.",a,b,f);
	getch();
}

#include<iostream.h>
#include<conio.h>
#include<fstream.h>
int main()
{
	int roll;
	char name[20];	
	ofstream outf("madhav.txt");	//creates a file madhav.txt
	cout<<"Enter name:";
	cin>>name;
	cout<<"Enter Roll No:";
	cin>>roll;
	outf<<"Name = "<<name;
	outf<<"\nRoll No. = "<<roll;
	outf<<endl;
	cout<<"\nData successfully written to disk.\n";
	outf.close();
	
	const int LEN = 80;
	char text[LEN];
	ifstream infile("madhav.txt");	//file is opened for read operation
	cout<<"\nThe data reading from file is:\n";
	while(infile)
	{
		infile.getline(text,LEN);
		cout<<endl<<text;
	}
	infile.close();
	
	getch();
	return 0;
}