Homework Answers

Following is the first four records in a file “data.txt”. 

71723 Ram     Sen     70 72 75 

91924 Raghubir Yadav   82 73 80

53425 Ram     Chauhan 93 81 86

44917 Ratan    Yadav   95 79 91

Each record contains ID(5 chars), 1 space, First name (10 chars),1 space, Second name (8 chars), 1space, marks in physics( 3chars), 1space, marks in chemistry(3 chars), 1space, marks in mathematics(3 chars) and a newline character.  

Write a shell program info.sh to achieve the following

If the program is run without any argument (sh info.sh), it will display the first name, second name and average score of each student in the file. 

If the program is run with numeric argument (sh info.sh 44917), it will assume it as ID of student and will output ID, first name, second name and the average score of that student. If ID does not match, the program should display “record not found”.

If the program is run with non-numeric

If the number of arguments is greater than one, the program should display an error message.

Table 1: Driving styles associated with acceleration values

Driving style Economic (1) Normal (2) Aggressive (3)

Acceleration magnitude [m/s2 ] 0.7-2.3 2.31-3.30 3.31-8.5 

Create variable ds mapping to store corresponding classification values of 1,2 or 3, which represent different driving style as shown in Table 1. You need to evaluate only the magnitude the of the acceleration/deceleration.

Create a class called Rational for performing arithmetic with fractions. Write a driver program to test your class.

Use integer variables to represent the private data of the class—the numerator and the denominator. Provide a constructor function that enables an object of this class to be initialized when it is declared. The constructor should contain default values in case no initializers are provided and should store the fraction in reduced form

Provide public member functions for each of the

following:

a) Addition of two Rational numbers. The result should be stored in reduced form.

b) Subtraction of two Rational numbers. The result should be stored in reduced form.

c) Multiplication of two Rational numbers. The result should be stored in reduced form.

d) Division of two Rational numbers. The result should be stored in reduced form.

e) Printing Rational numbers in the form a/b where a is the numerator and b is the denominator. in java

Question 20 (10 points)

Write the Java code required to solve the following problem. A complete program is

required and must follow all programming conventions (indenting, variable names,

comments, etc...).

You are to create a program which will place 8 queens on a chess board.

1 - Create a blank chessboard (8 x8 2D array of integers, all O's)

2 - Using a loop, ask the user for 8 locations on the board, replace the O with a 1 at.

this location.

3 - Display the final board.

You do not need to include any error checking or checking for duplicate locations.