CS141 Programming Assignment #5

Transcription

1 CS141 Programming Assignment #5 Due Wednesday, Nov 16th. 1) Write a class that asks the user for the day number (0 to 6) and prints the day name (Saturday to Friday) using switch statement. Solution 1: * assignment 5 Q1 public class Q1 { public static void main(string arg[]){ Scanner input = new Scanner(System.in); int daynumber; System.out.printf("Please, Enter the day number: \n"); daynumber = input.nextint(); switch (daynumber) { case 0: System.out.printf("saturday"); case 1: System.out.printf("sunday"); case 2: System.out.printf("monday"); case 3: System.out.printf("tuesday"); case 4: System.out.printf(" wednesday"); case 5: System.out.printf("thursday"); case 6: System.out.printf("friday"); default: System.out.printf("Invalid value"); //end of switch //end of main

2 2) Write a class that accepts user input from the console using switch. The class should take a number and then test for the following age ranges: 0 to 10, 11 to 20, 21 to 30, 30 and over. Display a message in the Output window in the following format: user_age + " is between 21 and 30" So if the user enters 27 as the age, the Output window should be this: 27 is between 21 and 30 If the user is 30 or over, you can just display the following message: You are 30 or over Solution 2: * assignment 5 Q2 public class Q2 { public static void main(string[]args){ Scanner input = new Scanner (System.in); int age; System.out.println("please enter your age : "); age =input.nextint(); switch ((age-1)/10) { case 0: System.out.println(age +" is between 0 to 10 "); case 1: System.out.println(age +" is between 11 to 20 "); case 2: System.out.println(age +" is between 21 to 30 "); default : System.out.print("You are 30 or over"); 3) Write a class that reads a string that is guaranteed to contain or. The program should construct another string with or replaced by and. At end, the new string should be displayed on screen. Example: I will study Math or Biology I will study Math and Biology Solution 3:

3 * assignment 5 Q3 import java.util.scanner ; public class Q3 { Scanner input= new Scanner(System.in); System.out.printf("Please, Enter the text: \n"); String str1 = input.nextline(); String str2=str1.replace("or","and"); System.out.println(str2); //end of main 4) Write a class that will read a string that is guaranteed to have 2 occurrences of the characters er. The program should print the positions of these 2 occurrences. Here is an execution sample: (The input is underlined) Enter your sentence (it should contain 2 occurrences of er ): Ali is older than ahmed and taller also The first occurrence of er is in position 10 The second occurrence of er is in position 32 Solution 4: * assignment 5 Q4 import java.util.scanner ; public class Q4 { Scanner input= new Scanner(System.in); System.out.println("Enter your sentence (it should contain 2 occurrences of er ):"); String str1 = input.nextline(); int pos1 = str1.indexof("er"); int pos2 = str1.indexof("er",pos1 + 2); System.out.printf("The first occurrence of er is in position %d \n",pos1); System.out.printf("The second occurrence of er is in position %d \n",pos2); //end of main

4 5) Write a class to calculate the value of base exponent For example, if the user base is 3 and the user exponent is 4 then calculates and print 34 (or 3 * 3 * 3 * 3). Assume that exponent is a positive, nonzero integer and that base is an integer. Use for or while statement to control the calculation. Do not use any Math class methods. Solution 5: * assignment 5 Q5 public class Q5 { int base, exp, result = 1 ; Scanner input = new Scanner(System.in); System.out.printf("Please, enter the value of the base : \n"); base =input.nextint(); System.out.printf("Please, enter the value of the exponent : \n"); exp = input.nextint(); for (int i = 0 ; i<exp ; i++ ) result*=base ; System.out.printf("%d to the power %d = %d",base,exp,result); //end of main 6) Write a class that calculates the hypotenuse of a right triangle when the lengths of the other two sides are given. The class should take two arguments of type double and print the hypotenuse as a double. Solution 6: * assignment 5 Q6 public class Q6 { Scanner input = new Scanner(System.in); double side1, side2, hyp, hypsqr; System.out.print("Enter the value for Side 1: "); side1 = input.nextdouble();

5 System.out.print("Enter the value for Side 2: "); side2 = input.nextdouble(); hypsqr = Math.pow(side1, 2) + Math.pow(side2, 2) ; hyp = Math.sqrt(hypsqr); System.out.printf("The length of the hypotenuse is: %.2f",hyp); //end of main 7) Write a class to do the following : a) prints the maximum integer in the array. b) prints the minimum integer in the array. c) prints the average of integers in the array. d) print the array sorted in ASD and DES order. e) print if array A and B are identical otherwise false f) print the index of the first negative found or -1 Test your class you implemented with the following arrays int [] a = {10, 5, -6, 0, 15, -12, 20; int [] b = {10, 5, -6, 0, 15, -12; Solution 7: * assignment 5 Q7 public class Q7 { int a[] = {10,5,-6,0,15,-12,20 ; int b[] = {10,5,-6,0,15,-12 ; System.out.println("Array a={10,5,-6,0,15,-12,20 \narray b={10,5, -6,0,15,-12 "); /*find the min, max and avg of array a int min =0, max = 0, index = -1 ; float sum = 0 ; for(int i = 0 ;i<a.length ; i++){ if (i ==0 ) min = max = a[0] ; if(a[i]<min) min = a[i];

6 if(a[i]>max) max = a[i]; sum+=a[i]; if(a[i] < 0 && index ==-1) index = i ; //end of for System.out.printf("\nFor array a the min is : %d, the max is : %d and the average is : %f \n",min,max,sum/a.length); if (index>=0) System.out.printf("\nThe index of the first negative number in array a is %d \n",index); else System.out.println( index); /* compare the arrays if (a.length!= b.length ) System.out.printf("\nThe two arrays a & b are not equal \n"); else { boolean equal=true; for (int i = 0; i < a.length; i++) if (a[i]!=b[i]) equal=false; if (equal) System.out.println("\nThe two arrays are equal "); else System.out.println("\nThe two arrays are not equal "); /* ASD ORDER of array a int t; for (int i = 0; i < a.length; i++) { for (int j = i + 1; j < a.length; j++) { if (a[i] > a[j]) { t = a[i]; a[i] = a[j]; a[j] = t; //end if //end for //end for System.out.println("Array a in ASD Order:"); for (int i = 0; i <a.length ; i++) System.out.printf("%d ",a[i]); System.out.print("\n\n");

7 /* DSD ORDER of array a for (int i = 0; i < a.length; i++) { for (int j = i + 1; j < a.length; j++) { if (a[i] < a[j]) { t = a[i]; a[i] = a[j]; a[j] = t; //end of if //end of j for //end of i for System.out.printf("Array a in DSD Order: \n"); for (int i = 0; i <a.length ; i++) System.out.printf("%d ",a[i]); //end of main