By | 27.12.2016

# Union of Two Sorted Arrays

Write a C++ Program to find Union of Two Sorted Arrays. Here’s simple Program to find Union of Two Sorted Arrays in C++ Programming Language.

## 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.

Here is source code of the C++ Program to find Union of Two Sorted Arrays. The C++ program is successfully compiled and run on a Windows system. The program output is also shown in below.

### SOURCE CODE : :

```/*  C++ Program to find Union of Two Sorted Arrays  */

#include<iostream>

using namespace std;

int main()
{
int a1[20],a2[20],u[40],i,j,k,n,m;

cout<<"Enter size of first array: ";
cin>>n;
cout<<"\nEnter elements to the array :: \n";

for(i=0;i<n;++i)
{
cout<<"\nEnter "<<i+1<<" element :: ";
cin>>a1[i];
}

cout<<"\nEnter size of second array: ";
cin>>m;
cout<<"\nEnter elements to the array :: \n";

for(i=0;i<m;++i)
{
cout<<"\nEnter "<<i+1<<" element :: ";
cin>>a2[i];
}

for(i=0,j=0,k=0;i<n&&j<m;){
if(a1[i]<a2[j]){
u[k]=a1[i];
i++;
k++;
}
else if(a1[i]>a2[j]){
u[k]=a2[j];
j++;
k++;
}
else{
u[k]=a1[i];
i++;
j++;
k++;
}
}

if(i<n){
for(;i<n;++i){
u[k]=a1[i];
k++;
}
}
else if(j<m){
for(;j<m;++j){
u[k]=a2[j];
k++;
}
}

cout<<"\nUnion of two arrays is :: \n\n";
for(i=0;i<k;++i)
{
cout<<u[i]<<"  ";
}

cout<<"\n";

return 0;
}```

### OUTPUT : :

```/*  C++ Program to find Union of Two Sorted Arrays  */

Enter size of first array: 4

Enter elements to the array ::

Enter 1 element :: 1

Enter 2 element :: 2

Enter 3 element :: 3

Enter 4 element :: 4

Enter size of second array: 4

Enter elements to the array ::

Enter 1 element :: 5

Enter 2 element :: 6

Enter 3 element :: 7

Enter 4 element :: 8

Union of two arrays is ::

1  2  3  4  5  6  7  8

Process returned 0```

Above is the source code for C++ Program to find Union of Two Sorted Arrays which is successfully compiled and run on Windows System.The Output of the program is shown above .

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