*Binary Search using array*

*Binary Search using array*

Write a C++ Program to implement Binary Search using array. Here’s simple Program to implement Binary Search using array in C++ Programming Language.

**What is an Array ?**

**What is an Array ?**

Arrays a kind of data structure that can store a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

Instead of declaring individual variables, such as number0, number1, …, and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and …, numbers[99] to represent individual variables. A specific element in an array is accessed by an index.

All arrays consist of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element.

* Binary search* is an algorithm used to search for an element in a sorted array. In this algorithm the targeted element is compared with middle element. If both elements are equal then position of middle element is returned and hence targeted element is found.

If both elements are unequal then if targeted element is less or more than middle element we discard the lower or upper half and the search continues by finding new middle element.

Here is source code of the C++ Program to implement Binary Search using array. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C++ Program to implement Binary Search using array */ #include<iostream> using namespace std; int main() { int search(int [],int,int); int n,i,a[100],e,res; cout<<"Enter size of Array :: "; cin>>n; cout<<"\nEnter elements to the array :: \n"; for(i=0;i<n;++i) { cout<<"\nEnter "<<i+1<<" element :: "; cin>>a[i]; } cout<<"\nEnter element to search :: "; cin>>e; res=search(a,n,e); if(res!=-1) cout<<"\nElement found at position "<<res+1<<"\n"; else cout<<"\nElement is not found....!!!"; return 0; } int search(int a[],int n,int e) { int f,l,m; f=0; l=n-1; while(f<=l) { m=(f+l)/2; if(e==a[m]) return(m); else if(e>a[m]) f=m+1; else l=m-1; } return -1; }

**OUTPUT : : **

**OUTPUT : :**

/* C++ Program to implement Binary Search using array */ Enter size of Array :: 6 Enter elements to the array :: Enter 1 element :: 2 Enter 2 element :: 5 Enter 3 element :: 7 Enter 4 element :: 9 Enter 5 element :: 11 Enter 6 element :: 16 Enter element to search :: 7 Element found at position 3 Process returned 0

Above is the source code for C++ Program to implement Binary Search using array which is successfully compiled and run on Windows System.The Output of the program is shown above .

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