Initial commit

Author: Asutosh989

.gitignore

@@ -0,0 +1,23 @@
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*

01.Introduction/BasicCalculator.java

@@ -0,0 +1,48 @@
+import java.util.Scanner;
+
+public class BasicCalculator{
+  public static void main(String args[]) {
+   Scanner sc = new Scanner(System.in);
+   if(!sc.hasNextDouble()){
+      System.out.println("Invalid input");
+      return;
+    }
+
+    double a = sc.nextDouble();
+
+    if(!sc.hasNext()){
+      System.out.println("Invalid input");
+      return;
+    }
+
+    char o = sc.next().trim().charAt(0);
+
+
+    if(!sc.hasNextDouble()){
+      System.out.println("Invalid input");
+      return;
+    }
+
+    double b = sc.nextDouble();
+
+    switch(o){
+      case '+':
+        System.out.println(a+b);
+        break;
+      case '-':
+        System.out.println(a-b);
+        break;
+      case '*':
+        System.out.println(a*b);
+        break;
+      case '/':
+        System.out.println(a/b);
+        break;
+      case '%':
+        System.out.println(a%b);
+        break;
+      default:
+        System.out.println("Invalid input");
+    }
+  }
+}

01.Introduction/BasicCalculatorArgv.java

@@ -0,0 +1,42 @@
+import java.util.Scanner;
+
+class BasicCalculatorArgv {
+    public static void main(String args[]) {
+        if(args.length != 3) {
+            System.out.println("Invalid input");
+            return;
+        }
+
+        try {
+
+            double a = Double.parseDouble(args[0]);
+
+            char op = args[1].charAt(0);
+
+            double b = Double.parseDouble(args[2]);
+
+            switch(op) {
+                case '+':
+                    System.out.println(a + b);
+                    break;
+                case '-':
+                    System.out.println(a - b);
+                    break;
+                case '*':
+                    System.out.println(a * b);
+                    break;
+                case '/':
+                    System.out.println(a / b);
+                    break;
+                case '%':
+                    System.out.println(a % b);
+                    break;
+                default:
+                    System.out.println("Invalid input");
+                    break;
+            }
+        } catch(NumberFormatException ex) {
+            System.out.println("Invalid input");
+        }
+    }
+}

01.Introduction/HelloMe.java

@@ -0,0 +1,9 @@
+import java.util.*;
+
+public class HelloMe {
+  public static void main(String args[]){
+    Scanner sc = new Scanner(System.in);
+    String s = sc.nextLine();
+    System.out.println("Hello "+s);
+  }
+}

01.Introduction/HelloMeFromArgs.java

@@ -0,0 +1,10 @@
+import java.util.*;
+
+public class HelloMeFromArgs {
+  public static void main(String args[]){
+    int i;
+    for (i=0;i<args.length;i++){
+      System.out.println("Hello "+args[i]);
+    }
+  }
+}

01.Introduction/HelloMeFromEnvVars.java

@@ -0,0 +1,7 @@
+import java.util.*;
+
+public class HelloMeFromEnvVars {
+  public static void main(String args[]){
+    System.out.println("Hello " + System.getenv("MY_NAME"));
+  }
+}

01.Introduction/HelloWorld.java

@@ -0,0 +1,7 @@
+import java.util.*;
+
+public class HelloWorld {
+  public static void main(String args[]){
+    System.out.println("Hello World");
+  }
+}

01.Introduction/MultiplesOfThreeOrFive.java

@@ -0,0 +1,17 @@
+import java.util.*;
+
+class MultiplesOfThreeOrFive {
+  public static void main(String args[]){
+    Scanner s = new Scanner(System.in);
+    int i,sum=0;
+    int a = s.nextInt();
+    for (i=1;i<a;i++){
+      if (i%3==0 || i%5==0){
+        sum+=i;
+
+      }
+
+    }
+    System.out.print(sum);
+  }
+}

01.Introduction/SumOfNumbers.java

@@ -0,0 +1,14 @@
+import java.util.*;
+
+class SumOfNumbers {
+  public static void main(String args[]){
+    Scanner s = new Scanner(System.in);
+    int i,sum=0;
+    int a = s.nextInt();
+    for (i=1;i<=a;i++){
+      sum+=i;
+    }
+    System.out.println(sum);
+
+  }
+}