diff --git a/src/TechInterview/BitManipulation1.java b/src/TechInterview/BitManipulation1.java
new file mode 100644
index 0000000..6ab0873
--- /dev/null
+++ b/src/TechInterview/BitManipulation1.java
@@ -0,0 +1,34 @@
+import java.util.Scanner;
+/**
+ * This class has solution to problem #5.1 'Insertion' 
+ * of chapter 'BitManipulation' from book 'Cracking the Coding Interview'.
+ * @author akanksha bhardwaj
+ */
+public class BitManipulation1 {
+    
+    public void insertion(String N, String M, int i, int j) {
+        int n = Integer.parseInt(N,2);
+        int m = Integer.parseInt(M,2);
+        /* divide new number in three parts 
+         * first part from number n  ,all bits from the most significant bit through j+1 (inclusive) 
+         * second part from number m complete
+         * third part from number n , all bits from i-1 through 0 (inclusive)
+         */
+        int first = n & (-1 << (j+1));
+        int second = m << i;
+        int third = n & ( (1 << i) -  1);
+        int num = (first | second ) | third ;
+        System.out.println(Integer.toBinaryString(num));
+    }
+    public static void main(String[] args) {
+    
+        BitManipulation1 bm = new BitManipulation1();
+        Scanner sc = new Scanner(System.in);
+        String N = sc.next();
+        String M  = sc.next();
+        int i = sc.nextInt();
+        int j = sc.nextInt();
+        bm.insertion(N , M , i, j);	
+        
+    }
+}
diff --git a/src/TechInterview/BitManipulation2.java b/src/TechInterview/BitManipulation2.java
new file mode 100644
index 0000000..a40b022
--- /dev/null
+++ b/src/TechInterview/BitManipulation2.java
@@ -0,0 +1,41 @@
+import static java.lang.Integer.max;
+import java.util.Scanner;
+/**
+ * This class has solution to the problem #5.3 Flip Bit to Win
+ * of chapter 'BitManipulation' from book 'Cracking the Coding Interview'.
+ * @author akanksha bhardwaj
+ */
+public class BitManipulation2 {
+    
+    public void flipToWin(int n) {
+        String s = Integer.toBinaryString(n);
+        int l = s.length();
+        char[] c = s.toCharArray();
+        int prev_zindex = -1 ;                         // store index to previously encourtered 0 bit
+        int max_seq = 0 , curr_seq = 0;
+        for(int i = 0 ; i < l; i++) {
+           if(c[i] == '0') {
+               if(prev_zindex == -1) {                 // first 0 bit encountered
+                   curr_seq = i + 1;
+                }
+               else {
+                    max_seq = max(max_seq , curr_seq); // update answer with sequence value according to previous 0 bit
+                    curr_seq = i - prev_zindex ;       // update current sequence length according to this 0 bit
+               }
+               prev_zindex = i;
+           }
+           else {
+               curr_seq += 1;
+           }
+        } 
+        max_seq = max(max_seq , curr_seq);
+        System.out.println(max_seq);        
+    }    
+    
+    public static void main(String[] args) {
+        BitManipulation2 bm = new BitManipulation2();
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+	      bm.flipToWin(n);
+    }
+}