diff --git a/binary_add.cpp b/binary_add.cpp
new file mode 100644
index 0000000..67ee8b0
--- /dev/null
+++ b/binary_add.cpp
@@ -0,0 +1,84 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int reverse(int n){
+    int ans = 0;
+    while(n>0){
+    int l = n % 10;
+    ans = ans *10 + l;
+    n /=10;
+    }
+    return ans;
+} 
+int binarysum(int a,int b){
+    int ans = 0, prevcarry = 0;
+    while(a > 0 && b > 0){
+        if(a%2 == 0 && b%2 == 0){
+            ans = ans*10 + prevcarry;
+            prevcarry = 0;
+        }
+        else if((a%2 == 0 && b%2 == 1) || (a%2 == 1 && b%2 == 0)){
+            if(prevcarry == 1){
+                ans = ans*10 + 0;
+                prevcarry = 1;
+            }
+            else{
+                ans = ans*10 + 1;
+                prevcarry = 0;
+            }
+        }
+        else{
+                  ans = ans*10 + prevcarry;
+                  prevcarry = 1;
+              }
+            
+            a/=10;
+            b/=10;
+}
+    
+    while(a > 0){
+        if(prevcarry == 1){
+            if(a%2 == 1){
+            ans = ans*10 + 0; 
+            prevcarry = 1;
+            }
+            else{
+            ans = ans*10 + 1; 
+            prevcarry = 0;
+            }
+        }
+        else{
+         ans = ans*10 + (a%2);
+        }
+        a/=10;
+    }
+while(b > 0){
+    if(prevcarry == 1){
+        if(b%2 == 1){
+            ans = ans*10 + 0; 
+            prevcarry = 1;
+            }
+            else{
+            ans = ans*10 + 1; 
+            prevcarry = 0;
+            }
+        }
+        else{
+         ans = ans*10 + (b%2);
+        }
+        b/=10;
+    }
+    if(prevcarry == 1){
+    ans = ans*10 + 1;
+    }
+    ans = reverse(ans);
+    return ans;
+}
+
+int main(){
+    int a,b;
+    cin >> a >> b;
+    cout << binarysum(a,b) << endl;
+
+return 0;
+}
diff --git a/decimaltobinary.cpp b/decimaltobinary.cpp
new file mode 100644
index 0000000..085220c
--- /dev/null
+++ b/decimaltobinary.cpp
@@ -0,0 +1,31 @@
+#include <iostream>
+using namespace std;
+ 
+// function to convert decimal to binary
+void decToBinary(int n)
+{
+    // array to store binary number
+    int binaryNum[32];
+ 
+    // counter for binary array
+    int i = 0;
+    while (n > 0) {
+ 
+        // storing remainder in binary array
+        binaryNum[i] = n % 2;
+        n = n / 2;
+        i++;
+    }
+ 
+    // printing binary array in reverse order
+    for (int j = i - 1; j >= 0; j--)
+        cout << binaryNum[j];
+}
+ 
+// Driver program to test above function
+int main()
+{
+    int n = 17;
+    decToBinary(n);
+    return 0;
+}