C++ is one of the most popular programming languages. It is based on C but is an object-oriented programming language. It is widely used in graphics libraries, games, network devices, etc.

//Program to find Largest number of three Integer

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{clrscr();

int a,b,c,largest;

cout<<"\n enter the integer:";

cin>>a>>b>>c;

largest=(a>b)?(a>c?a:c):(b>c?b:c);

cout<<"\n largest integer is:"<<largest;

getch();

}

//program to search an integer in an array of N integer using binary search method
#include<iostream.h>
#include<conio.h>
int Binary_Search(int a[],int n,int element);
void main()
{ clrscr();
  int A[20],N,ELEMENT,i,INDEX;
  cout<<"\n Enter the number of elements:";//Ascending order
  cin>>N;
  cout<<"\n Enter the elements of array:";
  for(i=0;i<N;i++)
  { cout<<"\n Enter A["<<i<<"]:";
cin>>A[i];
  }
  cout<<"\n Enter the element to be searched:";
  cin>>ELEMENT;
  INDEX=Binary_Search(A,N,ELEMENT);
  if(INDEX==-1)
  cout<<"\n Unsuccessful search";
  else
  cout<<"\n Element is present at "<<INDEX<<" and  is at position "<<(INDEX+1);
  getch();
}

int Binary_Search(int a[],int n,int element)
{ int beg=0,last=n-1,mid;
  while(beg<=last)
  { mid=(beg+last)/2;
if(a[mid]==element)
return mid;
else
if(a[mid]<element)
beg=mid+1;
else
last=mid-1;
  }
  return(-1);
}

//progarm to search an integer in an array of N integers using linear search
#include<iostream.h>
#include<conio.h>
int linear(int A[],int N,int ELEMENT)
{ for(int i=0;i<N;i++)
  { if(A[i]==ELEMENT)
return i;
  }
  return(-1);
}
void main()
{ clrscr();
  int a[20],n,element,i,p;
  cout<<"\n Enter the number of elements";
  cin>>n;
  cout<<"\n Enter the elements of array";
  for(i=0;i<n;i++)
  { cout<<"\n Enter a["<<i<<"]:";
cin>>a[i];
  }
  cout<<"\n Array is:";
  for(i=0;i<n;i++)
  cout<<a[i]<<"\t";
  cout<<"\n Enter the element to be searched:";
  cin>>element;
  p=linear(a,n,element);
  if(p==-1)
  cout<<"\n Unsucessful search";
  else
  cout<<"\n Element "<<element<<" is present at index "<<p<<" and at position "<<(p+1);
  getch();
}