#include<stdio.h>
#include <conio.h>

int sum(int, int);
void diff();
int prod();
void div(int, int);

void main()
{
 int a,b,res;
 clrscr();
 printf("Enter 2 numbers:");
 scanf("%d%d", &a,&b);
 res=sum(a,b);
 printf("nSum is %dn",res);
 diff();
 res=prod();
 printf("nThe product is %d",res);
 div(a,b);
 getch();
}

int sum(int x, int y)
{
 return(x+y);
}

void diff()
{
 int a,b;
 printf("nnEnter 2 numbers:");
 scanf("%d%d",&a,&b);
 printf("Difference id %d",a-b);
}


int prod()
{
 int a,b;
 printf("nnEnter two numbers:");
 scanf("%d%d",&a,&b);
 return(a*b);
}

void div(int x, int y)
{
 printf("nnDivision of %d and %d results in %f",x,y,(float) x/y);
}

#include <stdio.h>
#include <conio.h>

int hcf(int,int);

void main()
{
 int a,b,h;
 clrscr();
 printf("Enter two numbers:");
 scanf("%d%d",&a,&b);
 h=hcf(a,b);
 printf("nnHCF of %d and %d is %d.",a,b,h);
 getch();
}

int hcf(int x, int y)
{
 int rem;
 rem=x%y;
 if(x<y)
  return(hcf(y,x));
 else if(rem==0)
  return(y);
 else
  return(hcf(y,rem));
}