1

Author: xA98Kx

for_loop/Project_program2.java

@@ -0,0 +1,40 @@
+import java.util.Scanner;
+
+public class Project_program2
+{
+    public static void main(String[] args) {
+        Scanner x = new Scanner(System.in);
+        int ch,i,s=0;
+        System.out.println("Enter choice, 1 for the sum of the first 20 natural"+ 
+        " numbers and 2 to find the sum of the series'a^0-a^1.. n terms'");
+        ch = x.nextInt();
+        switch(ch)
+        {
+            case 1:
+            x.close();
+
+            for(i=1;i<=20;i++)
+            {
+                s = s+i;
+            }
+            System.out.println(s);
+            break;
+
+            case 2:
+            System.out.println("Enter the number");
+            int a = x.nextInt();
+            System.out.println("Enter the number of total terms to be iterated");
+            int n = x.nextInt();
+            x.close();
+            for (i=0;i<=n-1;i+=1)
+            {
+                s = s + (int)Math.pow(-a,i);
+            }
+            System.out.println(s);
+            break;
+
+            default: System.out.println("Error");
+            x.close();
+        }
+    }
+}

for_loop/Project_program3.java

@@ -0,0 +1,15 @@
+import java.util.Scanner;
+
+public class Project_program3 {
+    public static void main(String[] args) {
+        Scanner x = new Scanner(System.in);
+        int i,n,f=0;
+        System.out.println("Enter a numer to check whether its prime or composites");
+        n = x.nextInt();
+
+        for (i=2;i<=n/2;i++) if (n%i==0) f+=1;
+        if (f==0) System.out.println("Prime");
+        else System.out.println("Composite");
+        x.close();
+    }
+}

for_loop/Project_program5.java

@@ -0,0 +1,17 @@
+import java.util.Scanner;
+public class Project_program5 {
+   public static void main(String args[]){
+      int a, b, i, hcf = 0;
+      Scanner sc = new Scanner(System.in);
+      System.out.println("Enter first number :: ");
+      a = sc.nextInt();
+      System.out.println("Enter second number :: ");
+      b = sc.nextInt();
+
+      for(i = 1; i <= a || i <= b; i++) {
+         if( a%i == 0 && b%i == 0 )
+         hcf = i;
+      }
+      System.out.println("HCF of given two numbers is ::"+hcf);
+   }
+}

switch_case/Project_Program_1.java

@@ -15,11 +15,11 @@ public static void main(String[] args) {
         switch(ch)
         {
             case 1: System.out.println("Enter the sides of the triangle");
-            System.out.print("Side 1  ");
+            System.out.print("Side 1: ");
             a = x.nextDouble();
-            System.out.print("\n"+"Side 2  ");
+            System.out.print("Side 2: ");
             b = x.nextDouble();
-            System.out.print("\n"+"Side 3  ");
+            System.out.print("Side 3: ");
             c = x.nextDouble();
 
             s = (a+b+c)/2;