HCF

#include<iostream.h>

#include<conio.h>

int n1, n2, a, hcf;

void main()

{

  cout<<"Enter two numbers : ";

  cin>>n1>>n2;

  if(n1<n2)

    a=n1;

  else

    a=n2;

  for(int i=a; i>=1 ; i--)

  {

    if(n1%i==0 && n2%i==0)

    {

      hcf=i;

      break;

    }

  }

  cout<<"\nHCF = "<<hcf;

  getch();

}

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OUTPUT :(click to enlarge the image)

LCM

#include<iostream.h>

#include<conio.h>

int n1, n2, lcm,a;

void main()

{

  cout<<"Enter two integers : ";

  cin>>n1>>n2;

  cout<<"\nLCM = ";

  if(n1>n2)

    a=n2;

  else

    a=n1;

  for(int i=a; i<=((n1)*(n2)); i++)

  {

    if(i%n1==0 && i%n2==0)

    {

      lcm=i;

      break;

    }

  }

  cout<<"\n"<<lcm;

  getch();

}

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OUTPUT :(click to enlarge the image)

CHECKING A LIST OF INTEGERS FOR PALINDROME

#include<iostream.h>

#include<conio.h>

long int rev=0, a[10];

int nmbr;

void revrse(int n)

{

  do

  {

    int temp=n%10;

    rev=(rev*10)+temp;

    n=n/10;

  }while(n!=0);

}

void cmpare(int n)

{

  cout<<"\n\t"<<rev;

  if(n==rev)

    cout<<"PALINDROME";

  else

    cout<<"NON-PALINDROME";

  cout<<"\n";

}

void main()

{

  clrscr();

  cout<<"enter the number of integers : ";

  cin>>nmbr;

  cout<<"Enter the integers : ";

  for(int i=0 ; i<nmbr ; i++)

    cin>>a[i];

  for( i=0 ; i<nmbr ; i++)

  {

    revrse(a[i]);

    cmpare(a[i]);

    rev=0;

  }

  getch();

}

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OUTPUT :(click to enlarge the image)

SUM OF A RANGE

#include<iostream.h>

#include<conio.h>

void main()

{

 int n, m, a=0, b=0;

 cout<<"Enter the starting number :";

 cin>>n;

 cout<<"Enter the last number :";

 cin>>m;

 a=n;

 int i=0;

 do

 {

  a=n+i;

  b=b+a;

  i++;

 }while(i<=m-n);

 cout<<"Sum of the range ="<<b;

 getch();

}

.................................................................

OUTPUT: (click to enlarge the image)

CALCULATING EXPONENT USING - math.h

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{

 clrscr();

 int x, n;

 cout<<"Enter the base ";

 cin>>x;

 cout<<"Enter the power ";

 cin>>n;

 cout<<"The result of the given exponent is : "<<pow(x,n);

 getch();

}

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OUTPUT:(click to enlarge the image)

PRIME FACTORISATION

#include<iostream.h>

#include<conio.h>

void main()

{

 clrscr();

 int n, x, m;

 cout<<"Enter any number : ";

 cin>>n;

 cout<<"Prime factors : \n";

 m=n;

 for(int i=2; i<=n/2;)

  {

   x=m%i;

   if(x==0)

    {

     cout<<i<<"\n";

     m=m/i;

    }

   else

    i=++i;

  }

 getch();

}
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OUTPUT:(click on image to enlarge)

CHECK EVEN OR ODD NUMBER

#include<iostream.h>

#include<conio.h>

void main()

{

 clrscr();

 int a;

 cout<<"Enter any number : ";

 cin>>a;

 (a%2==0)?cout<<"Even number":cout<<"Odd number";

 getch();

}
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OUTPUT:(click on image to enlarge)

CHECK FOR PRIME NUMBER

#include<iostream.h>

#include<conio.h>

void main()

{

 clrscr();

 int n, x;

 cout<<"Enter a number :";

 cin>>n;

 for(int i=2; i<=n/2; i++)

  {

   x=n%i;

   if(x==0)

    {

     cout<<"\nNon-prime number";

     i=n+1;

    }

  }

 if(x>0)

  cout<<"\nPrime number";

 getch();

}
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OUTPUT:(click on image to enlarge)