Chapter 4 Practice Set Solutions

Author: kishanrajput23

19.Chapter_4_practice_set/cwh_19_ch4_ps_pr_01.java

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+public class cwh_19_ch4_ps_pr_01 {
+    public static void main(String args[]) {
+        int a = 10;
+        if (a = 11) {
+            system.out.println("I am 11");
+        }
+        else {
+            system.out.println("I am not 11");
+        }
+        // This program will through an error beacuse in if conditon
+        // a=11 is an assignment operator and we can't put assignment operator in if condition
+        // if we use a == 11 then will properly run the program
+    }
+}

19.Chapter_4_practice_set/cwh_19_ch4_ps_pr_02.java

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+import java.util.*;
+
+public class cwh_19_ch4_ps_pr_02 {
+    public static void main(String args[]) {
+        byte m1, m2, m3;
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter your marks in Physics");
+        m1 = sc.nextByte();
+
+        System.out.println("Enter your marks in Chemistry");
+        m2= sc.nextByte();
+
+        System.out.println("Enter your marks in Mathematics");
+        m3 = sc.nextByte();
+        float avg = (m1+m2+m3)/3.0f;
+        System.out.println("Your Overall percentage is: " + avg);
+        if(avg>=40 && m1>=33 && m2>=33 && m3>=33){
+            System.out.println("Congratulations, You have been promoted");
+        }
+        else{
+            System.out.println("Sorry, You have not been promoted! Please try again.");
+        }
+    }
+}

19.Chapter_4_practice_set/cwh_19_ch4_ps_pr_03.java

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+import java.util.*;
+
+public class cwh_19_ch4_ps_pr_03 {
+    public static void main(String args[]) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter your income in Lakhs per annum");
+        float tax = 0;
+        float income = sc.nextFloat();
+        if(income<=2.5){
+            tax = tax + 0;
+        }
+        else if(income>2.5f && income <= 5f){
+            tax = tax + 0.05f * (income - 2.5f);
+        }
+        else if(income>5f && income <= 10.0f){
+            tax = tax + 0.05f * (5.0f - 2.5f);
+            tax = tax + 0.2f * (income - 5f);
+        }
+        else if(income>10.0f){
+            tax = tax + 0.05f * (5.0f - 2.5f);
+            tax = tax + 0.2f * (10.0f - 5f);
+            tax = tax + 0.3f * (income - 10.0f);
+        }
+
+        System.out.println("The total tax paid by the employee is: " + tax);
+
+    }
+}