diff --git a/array/bubble_sort.cpp b/array/bubble_sort.cpp
new file mode 100644
index 0000000..4681f38
--- /dev/null
+++ b/array/bubble_sort.cpp
@@ -0,0 +1,32 @@
+/*  Bubble sort program using function and array
+*/
+#include<iostream>
+#include<stdlib.h>
+#include<iomanip>
+#include "io.cpp"
+using namespace std;
+void bubble(int a[],int n){
+	int i,j,temp;
+	for(i=0;i<n-1;i++)   // steps
+	  {
+	  	for(j=0;j<n-1-i;j++)
+	  	  if(a[j]>a[j+1]) 
+	  	    {
+	  	    	temp = a[j];
+	  	    	a[j]= a[j+1];
+	  	    	a[j+1]=temp;
+			  }
+	  }
+}
+
+int main(){
+	int a[10];
+	//input phase
+	input(a,10);
+	//processing phase
+	bubble(a,10);
+	// output phase
+	cout<<"\n Sorted array :";
+	output(a,10);
+	return 0;
+}
diff --git a/array/fun_array-4.cpp b/array/fun_array-4.cpp
new file mode 100644
index 0000000..0038418
--- /dev/null
+++ b/array/fun_array-4.cpp
@@ -0,0 +1,38 @@
+/*  array declaration + initialization from keyboard
+*/
+
+#include<iostream>
+#include<stdlib.h>
+#include<iomanip>
+
+using namespace std;
+
+void fun_add(int a[],int n){
+	int i;
+	for(i=0;i<n;i++)
+		a[i] = a[i]+10;
+}
+
+int main(){
+	int a[10];
+	int i;
+	
+	//input phase
+	for(i=0;i<10;i++)
+	{
+		cout<<"\n Enter a["<<i+1<<"] number ";
+		cin>>a[i];
+	}
+	
+	//processing phase
+	
+	fun_add(a,5);
+	
+	// output phase
+	
+	cout<<"\n Modified array :";
+	for(i=0;i<10;i++)
+		cout<<setw(10)<<a[i];
+
+	return 0;
+}
diff --git a/array/fun_array-5.cpp b/array/fun_array-5.cpp
new file mode 100644
index 0000000..a3a38a3
--- /dev/null
+++ b/array/fun_array-5.cpp
@@ -0,0 +1,45 @@
+/*  array declaration + initialization from keyboard
+*/
+
+#include<iostream>
+#include<stdlib.h>
+#include<iomanip>
+
+using namespace std;
+
+void output(int a[],int n){
+	for(int i=0;i<n;i++)
+		cout<<setw(10)<<a[i];
+}
+
+void input(int x[],int n){
+	for(int i=0;i<n;i++)
+	  {
+	  	cout<<"Enter x["<<i+1<<"] number : ";
+	  	cin>>x[i];
+	  }
+}
+
+void fun_add(int a[],int n){
+	int i;
+	for(i=0;i<n;i++)
+		a[i] = a[i]+10;
+}
+
+int main(){
+	int a[10];
+	
+	
+	//input phase
+	input(a,10);
+	
+	//processing phase
+	
+	fun_add(a,10);
+	
+	// output phase
+	
+	cout<<"\n Modified array :";
+	output(a,10);
+	return 0;
+}
diff --git a/array/fun_from_other_file.cpp b/array/fun_from_other_file.cpp
new file mode 100644
index 0000000..2382dfa
--- /dev/null
+++ b/array/fun_from_other_file.cpp
@@ -0,0 +1,24 @@
+/*  array declaration + initialization from keyboard
+*/
+#include<iostream>
+#include<stdlib.h>
+#include<iomanip>
+#include "io.cpp"
+using namespace std;
+void fun_add(int a[],int n){
+	int i;
+	for(i=0;i<n;i++)
+		a[i] = a[i]+10;
+}
+
+int main(){
+	int a[10];
+	//input phase
+	input(a,10);
+	//processing phase
+	fun_add(a,10);
+	// output phase
+	cout<<"\n Modified array :";
+	output(a,10);
+	return 0;
+}
diff --git a/array/io.cpp b/array/io.cpp
new file mode 100644
index 0000000..92237bc
--- /dev/null
+++ b/array/io.cpp
@@ -0,0 +1,23 @@
+/*  array declaration + initialization from keyboard
+*/
+
+#include<iostream>
+#include<stdlib.h>
+#include<iomanip>
+
+using namespace std;
+
+void output(int a[],int n){
+	for(int i=0;i<n;i++)
+		cout<<setw(10)<<a[i];
+}
+
+void input(int x[],int n){
+	for(int i=0;i<n;i++)
+	  {
+	  	cout<<"Enter x["<<i+1<<"] number : ";
+	  	cin>>x[i];
+	  }
+}
+
+