diff --git a/Q1.java b/Q1.java
new file mode 100644
index 0000000..b7fba4f
--- /dev/null
+++ b/Q1.java
@@ -0,0 +1,14 @@
+public class Q1
+{
+    public static void main(String[] args)
+    {
+        int num = 5;
+
+        if (num > 0)
+            System.out.println("The number is positive");
+        else if (num < 0)
+            System.out.println("The number is negative");
+        else
+            System.out.println("Zero");
+    }
+}
\ No newline at end of file
diff --git a/Tisa_evenodd_q2.java b/Tisa_evenodd_q2.java
new file mode 100644
index 0000000..9b9fe73
--- /dev/null
+++ b/Tisa_evenodd_q2.java
@@ -0,0 +1,11 @@
+public class Tisa_evenodd_q2 {
+    public static void main(String[] args){
+        int a=5;
+        if(a%2==0){
+            System.out.println("Even number");
+        }
+        else{
+            System.out.println("Odd number");
+        }
+    }
+}
diff --git a/Tisa_greatestthreeno_q6.java b/Tisa_greatestthreeno_q6.java
new file mode 100644
index 0000000..87143a3
--- /dev/null
+++ b/Tisa_greatestthreeno_q6.java
@@ -0,0 +1,31 @@
+
+    import java.util.Scanner;
+
+public class Tisa_greatestthreeno_q6 {
+    public static void main(String[] args) {
+
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter first number: ");
+        int a = sc.nextInt();
+
+        System.out.print("Enter second number: ");
+        int b = sc.nextInt();
+
+        System.out.print("Enter third number: ");
+        int c = sc.nextInt();
+
+        if (a >= b && a >= c) {
+            System.out.println("Greatest number is: " + a);
+        } 
+        else if (b >= a && b >= c) {
+            System.out.println("Greatest number is: " + b);
+        } 
+        else {
+            System.out.println("Greatest number is: " + c);
+        }
+
+        sc.close();
+    }
+}
+
diff --git a/Tisa_greatesttwonumbers_q5.java b/Tisa_greatesttwonumbers_q5.java
new file mode 100644
index 0000000..31d3897
--- /dev/null
+++ b/Tisa_greatesttwonumbers_q5.java
@@ -0,0 +1,25 @@
+import java.util.Scanner;
+
+public class Tisa_greatesttwonumbers_q5{
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter first number: ");
+        int a = sc.nextInt();
+
+        System.out.print("Enter second number: ");
+        int b = sc.nextInt();
+
+        if (a > b) {
+            System.out.println("Greatest number is: " + a);
+        } else if (b > a) {
+            System.out.println("Greatest number is: " + b);
+        } else {
+            System.out.println("Both numbers are equal");
+        }
+
+        sc.close();
+    }
+} 
+    
+
diff --git a/Tisa_positiveornegative_q1.java b/Tisa_positiveornegative_q1.java
new file mode 100644
index 0000000..f2d1d50
--- /dev/null
+++ b/Tisa_positiveornegative_q1.java
@@ -0,0 +1,16 @@
+public class Tisa_positiveornegative_q1 {
+    public static void main (String[]args)
+  {
+
+    int num = 5;
+
+    //Conditions to check if the number is negative or positive
+    if (num > 0)
+        System.out.println ("The number is positive");
+    else if (num < 0)
+        System.out.println ("The number is negative");
+    else
+        System.out.println ("Zero");
+  }
+}
+
diff --git a/Tisa_suminrange_q3.java b/Tisa_suminrange_q3.java
new file mode 100644
index 0000000..d8578ab
--- /dev/null
+++ b/Tisa_suminrange_q3.java
@@ -0,0 +1,13 @@
+import java.util.*;
+public class Tisa_suminrange_q3 {
+    public static void main(String[] args){
+        Scanner sc=new Scanner(System.in);
+        int a=sc.nextInt();
+        int b=sc.nextInt();
+        int sum=0;
+        for(int i=a;i<=b;i++){
+            sum+=i;
+        }
+        System.out.println(sum);
+    }
+}
diff --git a/Tisa_sumnaturalnumbers_q4.java b/Tisa_sumnaturalnumbers_q4.java
new file mode 100644
index 0000000..12ac00f
--- /dev/null
+++ b/Tisa_sumnaturalnumbers_q4.java
@@ -0,0 +1,13 @@
+import java.util.*;
+public class Tisa_sumnaturalnumbers_q4 {
+    public static void main(String[] args){
+        Scanner sc=new Scanner(System.in);
+        int a=sc.nextInt();
+        int sum=0;
+        for(int i=1;i<=a;i++){
+            sum+=i;
+
+        }
+        System.out.println(sum);
+    }
+}