diff --git a/Cartesian_Product.c b/Cartesian_Product.c
new file mode 100644
index 0000000..77e5bb9
--- /dev/null
+++ b/Cartesian_Product.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <conio.h>
+int main()
+{
+    int i,j,m,n;
+    int a[1000000];
+    int b[1000000];
+    printf("Enter length of set A and B \n");
+    scanf("%d%d",&n,&m);
+    printf("Enter elements of set A \n");
+    for(i=0;i<n;i++)
+    scanf("%d",&a[i]);
+    printf("Enter elements of set B \n");
+     for(i=0;i<m;i++)
+    scanf("%d",&b[i]);
+    printf("{");
+    for(i=0;i<n;i++)
+    {
+        for(j=0;j<m;j++)
+        {
+            printf("(%d,%d)",a[i],b[j]);
+        }
+    }
+    printf("}");
+    getch();
+    return 0;
+}
+    
+    
\ No newline at end of file
diff --git a/Emrip.cpp b/Emrip.cpp
new file mode 100644
index 0000000..22ba38c
--- /dev/null
+++ b/Emrip.cpp
@@ -0,0 +1,44 @@
+/******************************************************************************
+
+                              Online C++ Compiler.
+               Code, Compile, Run and Debug C++ program online.
+Write your code in this editor and press "Run" button to compile and execute it.
+
+*******************************************************************************/
+
+#include <iostream>
+
+using namespace std;
+
+int  prime(int n)
+{
+    int i=2;
+    while(i<n)
+    {
+        if(n%i==0)
+         break;
+        i++;
+    }
+    if(i!=n)
+    return false;
+    return true;
+}
+
+int main()
+{   
+    int n,c,r=0,i,a;
+    cin>>n;
+    a=n;
+    while(a>0)
+    {
+        r=r*10+a%10;
+        a=a/10;
+    }
+    if( prime(n) && prime(r))
+    {
+        cout<<"Emrip Number";
+    }
+    else 
+     cout<<"Not an emrip number";
+    return 0;
+}
diff --git a/decimalToBinary.cpp b/decimalToBinary.cpp
new file mode 100644
index 0000000..30550bb
--- /dev/null
+++ b/decimalToBinary.cpp
@@ -0,0 +1,33 @@
+/******************************************************************************
+
+                              Online C++ Compiler.
+               Code, Compile, Run and Debug C++ program online.
+Write your code in this editor and press "Run" button to compile and execute it.
+
+*******************************************************************************/
+
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    int i,j,k,l,m,n,a,b,c;
+    int arr[1000000];
+    cin>>n;
+    i=0;j=0;
+    while(n>0)
+    {
+        arr[i++]=n%2;
+        n=n/2;
+        j++;
+    }
+    while(i>=0)
+    {
+        cout<<arr[i];
+        i--;
+    }
+    cout<<"\n";
+    return 0;
+}
+
diff --git a/fibonacci.cpp b/fibonacci.cpp
new file mode 100644
index 0000000..0d65859
--- /dev/null
+++ b/fibonacci.cpp
@@ -0,0 +1,32 @@
+/******************************************************************************
+
+                              Online C++ Compiler.
+               Code, Compile, Run and Debug C++ program online.
+Write your code in this editor and press "Run" button to compile and execute it.
+
+*******************************************************************************/
+
+#include <iostream>
+
+using namespace std;
+
+void fibo(int a,int b,int n)
+{   int c;
+    if(a<=n)
+    {
+        cout<<a<<" ";
+        c=a+b;
+        a=b;
+        b=c;
+        fibo(a,b,n);
+    }
+}
+int main()
+{
+    cout<<"Enter limit n \n";
+    int n;
+    cin>>n;
+    fibo(0,1,n);
+
+    return 0;
+}