CSC 1760 Introduction to Programming
Lesson 15: Methods
Due Date: 3/16/2009
1. Textbook: Introduction to Java Programming, Brief Version, Seventh Edition,
Author: Y. Daniel Liang, 2009, Prentice Hall
a. Chapter 5
2. Overview
Demonstrate using methods.
3. Tasks
a. Write a method named printMatrix.java that displays an n-by-n matrix,
using the following header:
public static void printMatrix(int n)
Each element is a random number between 0 and 9.
Write a test program named RandomNumbsTest.java that inputs the
matrix size and displays the matrix. For example, the user might input 3,
and the program will print a 3-by-3 matrix that may look like this:
0 9 4
3 8 0
2 5 8
where the numbers in the matrix are randomly generated using the
Math.random() method.
b. Write a program named SinCosDisplay.java that uses the Math.sin and
Math.cos methods to display sin value and cos value of degrees from 0 to
360 with increments of 10 degrees. Round the values to keep four digits
after the decimal point. (Hint: Math.cos and Math.sin only accept radians
not degrees as parameters.)
Degree Sin Cos
0 0.0 1.0
10 0.1736 0.9848
…
350 -0.1736 0.9849
360 0.0 1.0
4. Assignments due:
a. printMatrix.java
b. RandomNumbsTest.java
