Lab 0 | |
Welcome to Lab 1 | |
Lab 2 | |
Lab 3 | |
Lab 4 | |
Lab 5 | |
Lab 6 | |
Lab 7 | |
Lab 8 | |
Sample Report |
By the end of this Lab you should be able to do the following.
public class MathLibraryExample { public static void main(String[] args) { int i = 7; int j = -9; double x = 72.3; double y = 0.34; System.out.println("i is " + i); System.out.println("j is " + j); System.out.println("x is " + x); System.out.println("y is " + y); // The absolute value of a number is equal to // the number if the number is positive or // zero and equal to the negative of the number // if the number is negative. System.out.println("|" + i + "| is " + Math.abs(i)); System.out.println("|" + j + "| is " + Math.abs(j)); System.out.println("|" + x + "| is " + Math.abs(x)); System.out.println("|" + y + "| is " + Math.abs(y)); // Truncating and Rounding functions // You can round off a floating point number // to the nearest integer with round() System.out.println(x + " is approximately " + Math.round(x)); System.out.println(y + " is approximately " + Math.round(y)); // The "ceiling" of a number is the // smallest integer greater than or equal to // the number. Every integer is its own // ceiling. System.out.println("The ceiling of " + i + " is " + Math.ceil(i)); System.out.println("The ceiling of " + j + " is " + Math.ceil(j)); System.out.println("The ceiling of " + x + " is " + Math.ceil(x)); System.out.println("The ceiling of " + y + " is " + Math.ceil(y)); // The "floor" of a number is the largest // integer less than or equal to the number. // Every integer is its own floor. System.out.println("The floor of " + i + " is " + Math.floor(i)); System.out.println("The floor of " + j + " is " + Math.floor(j)); System.out.println("The floor of " + x + " is " + Math.floor(x)); System.out.println("The floor of " + y + " is " + Math.floor(y)); // Comparison operators // min() returns the smaller of the two arguments you pass it System.out.println("min(" + i + "," + j + ") is " + Math.min(i,j)); System.out.println("min(" + x + "," + y + ") is " + Math.min(x,y)); System.out.println("min(" + i + "," + x + ") is " + Math.min(i,x)); System.out.println("min(" + y + "," + j + ") is " + Math.min(y,j)); // There's a corresponding max() method // that returns the larger of two numbers System.out.println("max(" + i + "," + j + ") is " + Math.max(i,j)); System.out.println("max(" + x + "," + y + ") is " + Math.max(x,y)); System.out.println("max(" + i + "," + x + ") is " + Math.max(i,x)); System.out.println("max(" + y + "," + j + ") is " + Math.max(y,j)); // The Math library defines a couple // of useful constants: System.out.println("Pi is " + Math.PI); System.out.println("e is " + Math.E); // Trigonometric methods // All arguments are given in radians // Convert a 45 degree angle to radians double angle = 45.0 * 2.0 * Math.PI/360.0; System.out.println("cos(" + angle + ") is " + Math.cos(angle)); System.out.println("sin(" + angle + ") is " + Math.sin(angle)); // Inverse Trigonometric methods // All values are returned as radians double value = 0.707; System.out.println("acos(" + value + ") is " + Math.acos(value)); System.out.println("asin(" + value + ") is " + Math.asin(value)); System.out.println("atan(" + value + ") is " + Math.atan(value)); // Exponential and Logarithmic Methods // exp(a) returns e (2.71828...) raised // to the power of a. System.out.println("exp(1.0) is " + Math.exp(1.0)); System.out.println("exp(10.0) is " + Math.exp(10.0)); System.out.println("exp(0.0) is " + Math.exp(0.0)); // log(a) returns the natural // logarithm (base e) of a. System.out.println("log(1.0) is " + Math.log(1.0)); System.out.println("log(10.0) is " + Math.log(10.0)); System.out.println("log(Math.E) is " + Math.log(Math.E)); // pow(x, y) returns the x raised // to the yth power. System.out.println("pow(2.0, 2.0) is " + Math.pow(2.0,2.0)); System.out.println("pow(10.0, 3.5) is " + Math.pow(10.0,3.5)); System.out.println("pow(8, -1) is " + Math.pow(8,-1)); // sqrt(x) returns the square root of x. for (i=0; i < 10; i++) { System.out.println( "The square root of " + i + " is " + Math.sqrt(i)); } // Finally there's one Random method // that returns a pseudo-random number // between 0.0 and 1.0; System.out.println("Here's one random number: " + Math.random()); System.out.println("Here's another random number: " + Math.random()); } }
Create a program that asks the user for the radius of a circle and then calculates and prints out the the diameter, the circumference, and the area of a circle with that radius.