// Your names here!
// Save as Lab3.java
// run the main method (at the bottom) to test your functions
// using the red running person icon on the speedbar
// You can also test using: Lab3.methodName(actualParameters)
public class Lab3 {
// these methods are stubs with a default return value
//
// replace the code in between the curlies {} for each method
//
// don't change the function signatures:
// (name, return type, number or parameters, types of parameters)
// returns the absolute value of x:
// x, if x is positive or 0
// -x, if x is negative
public static double abs(double x) {
return 0.0;
}
// returns true when n is even
// returns false when n is odd
public static boolean isEven(int n) {
return false;
}
// returns true when n is odd
// returns false when n is even
public static boolean isOdd(int n) {
return false;
}
// returns true if c is a vowel (a, e, i, o, or u)
// This should work for both upper or lower case
// remeber single quotes specify a literal char value
// thus 'a' is the first letter of the alphabet
public static boolean isVowel(char c) {
return false;
}
// returns true if n is a perfect square
// n=a*a for some a
// hint: use (int) Math.sqrt(n)
public static boolean isSquare(int n) {
return false;
}
// returns v when v is a valid color index from 0 to 255 inclusive
// returns 0 when v is negative
// returns 255 when v is larger than 255
public static int clip(int v) {
return 0;
}
// returns hours*rate when hours are less than or equal to 40
// returns the base rate plus any hours above 40 at 1.5 times base rate
// Michigan minimum wage is $8.90/hour
public static double wages(double hours, double rate) {
return 0.0;
}
// returns true if (x,y) is inside the rectangle with corners (x1,y1) and (x2,y2)
// Assume x1>>> 31
// 2 (February) >>>> 28 (normally) or 29 (leap year)
// 3 (March) >>>> 31
// 4 (April) >>>> 30
// 5 (May) >>>> 31
// 6 (June) >>>> 30
// 7 (July) >>>> 31
// 8 (August) >>>> 31
// 9 (September) >>>> 30
// 10 (October) >>>> 31
// 11 (November) >>>> 30
// 12 (December) >>>> 31
// Hint: Use the || operator and your isLeapYear() method
public static int daysInMonth(int month, int year) {
return 0;
}
// determine if a household is in poverty depending on the
// following cutoff values:
// 12,082 for 1 person
// 15,391 for 2 people
// 18,871 for 3 people
// 24,257 for 4 people
// 28,741 for 5 people
// 32,542 for 6 people
// 36,998 for 7 people
// 41,029 for 8 people
// 49,177 for 9 people
// https://www.census.gov/newsroom/press-releases/2016/cb16-158.html
public static boolean inPoverty(double wages, int people) {
return false;
}
// single taxes based on income
// https://www.irs.com/articles/projected-us-tax-rates-2016
// income : tax rate
//$0—$9,275 : 10%
//$9,276—$37,650 : $927.50 plus 15% of the amount over $9,275
//$37,651—$91,150 : $5,183.75 plus 25% of the amount over $37,650
//$91,151—$190,150 : $18,558.75 plus 28% of the amount over $91,150
//$190,151—$ 413,350 : $46,278.75 plus 33% of the amount over $190,150
//$413,351—$415,050 : $119,934.75 plus 35% of the amount over $413,350
//$415,051 or more : $120,529.75 plus 39.6% of the amount over $415,050
public static double taxes(double income) {
return 0.0;
}
// don't change the main method below except to add additional test cases
public static void main(String args[]) {
System.out.println("Lab 3");
System.out.println();
System.out.printf("abs(%f) = %f should be 1\n", -1D, abs(-1));
System.out.printf("abs(%f) = %f should be 0\n", 0D, abs(0));
System.out.printf("abs(%f) = %f should be 1\n", 1D, abs(1));
System.out.println();
System.out.printf("isEven(%d) = %b should be true\n", -2, isEven(-2));
System.out.printf("isEven(%d) = %b should be true\n", 0, isEven(0));
System.out.printf("isEven(%d) = %b should be false\n", 1, isEven(1));
System.out.println();
System.out.printf("isOdd(%d) = %b should be false\n", -2, isOdd(-2));
System.out.printf("isOdd(%d) = %b should be false\n", 0, isOdd(0));
System.out.printf("isOdd(%d) = %b should be true\n", 1, isOdd(1));
System.out.println();
System.out.printf("isVowel(%c) = %b should be true\n", 'A', isVowel('A'));
System.out.printf("isVowel(%c) = %b should be true\n", 'a', isVowel('a'));
System.out.printf("isVowel(%c) = %b should be true\n", 'e', isVowel('e'));
System.out.printf("isVowel(%c) = %b should be true\n", 'i', isVowel('i'));
System.out.printf("isVowel(%c) = %b should be true\n", 'o', isVowel('o'));
System.out.printf("isVowel(%c) = %b should be true\n", 'u', isVowel('u'));
System.out.printf("isVowel(%c) = %b should be false\n", 'b', isVowel('b'));
System.out.println();
System.out.printf("isSquare(%d) = %b should be true\n", 0, isSquare(0));
System.out.printf("isSquare(%d) = %b should be true\n", 1, isSquare(1));
System.out.printf("isSquare(%d) = %b should be false\n", 2, isSquare(2));
System.out.printf("isSquare(%d) = %b should be false\n", 3, isSquare(3));
System.out.printf("isSquare(%d) = %b should be true\n", 4, isSquare(4));
System.out.printf("isSquare(%d) = %b should be false\n", 65535, isSquare(65535));
System.out.println();
System.out.printf("clip(%d) = %d should be 0\n", -1, clip(-1));
System.out.printf("clip(%d) = %d should be 0\n", 0, clip(0));
System.out.printf("clip(%d) = %d should be 128\n", 128, clip(128));
System.out.printf("clip(%d) = %d should be 255\n", 255, clip(255));
System.out.printf("clip(%d) = %d should be 255\n", 256, clip(256));
System.out.println();
System.out.printf("wages(10,8.90) = %.2f should be 89.00\n", wages(10,8.90));
System.out.printf("wages(40,8.90) = %.2f should be 356.00\n", wages(40,8.90));
System.out.printf("wages(50,8.90) = %.2f should be 489.50\n", wages(50,8.90));
System.out.println();
System.out.printf("inRectangle(0,0,0,0,10,10) = %b should be true\n", inRectangle(0,0,0,0,10,10));
System.out.printf("inRectangle(0,0,5,5,10,10) = %b should be false\n", inRectangle(0,0,5,5,10,10));
System.out.printf("inRectangle(100,10,50,15,150,150) = %b should be false\n", inRectangle(100,10,50,15,150,150));
System.out.printf("inRectangle(100,10,50,5,150,150) = %b should be true\n", inRectangle(100,10,50,5,150,150));
System.out.println();
System.out.printf("inEllipse(100,100,100,100,20,30) = %b should be true\n", inEllipse(100,100,100,100,20,30));
System.out.printf("inEllipse(120,130,100,100,20,30) = %b should be false\n", inEllipse(120,130,100,100,20,30));
System.out.println();
System.out.printf("dayTime(1) = \"%s\" should be \"night\"\n", dayTime(1));
System.out.printf("dayTime(5) = \"%s\" should be \"night\"\n", dayTime(5));
System.out.printf("dayTime(23) = \"%s\" should be \"night\"\n", dayTime(23));
System.out.printf("dayTime(8) = \"%s\" should be \"morning\"\n", dayTime(8));
System.out.printf("dayTime(13) = \"%s\" should be \"afternoon\"\n", dayTime(13));
System.out.printf("dayTime(20) = \"%s\" should be \"evening\"\n", dayTime(20));
System.out.println();
System.out.printf("seasonOfTheYear(1,1) = \"%s\" should be \"winter\"\n", seasonOfTheYear(1,1));
System.out.printf("seasonOfTheYear(3,1) = \"%s\" should be \"winter\"\n", seasonOfTheYear(3,1));
System.out.printf("seasonOfTheYear(3,31) = \"%s\" should be \"spring\"\n", seasonOfTheYear(3,31));
System.out.printf("seasonOfTheYear(6,30) = \"%s\" should be \"summer\"\n", seasonOfTheYear(6,30));
System.out.printf("seasonOfTheYear(9,30) = \"%s\" should be \"fall\"\n", seasonOfTheYear(9,30));
System.out.printf("seasonOfTheYear(12,30) = \"%s\" should be \"winter\"\n", seasonOfTheYear(12,30));
System.out.println();
System.out.printf("isLeapYear(%d) = %b should be true\n", 2000, isLeapYear(2000));
System.out.printf("isLeapYear(%d) = %b should be true\n", 2016, isLeapYear(2016));
System.out.printf("isLeapYear(%d) = %b should be true\n", 2020, isLeapYear(2020));
System.out.printf("isLeapYear(%d) = %b should be false\n", 2017, isLeapYear(2017));
System.out.printf("isLeapYear(%d) = %b should be false\n", 2018, isLeapYear(2018));
System.out.printf("isLeapYear(%d) = %b should be false\n", 1900, isLeapYear(1900));
System.out.printf("isLeapYear(%d) = %b should be false\n", 2100, isLeapYear(2100));
System.out.println();
System.out.printf("daysInMonth(1,2017) = %d should be 31\n", daysInMonth(1,2017));
System.out.printf("daysInMonth(2,2017) = %d should be 28\n", daysInMonth(1,2017));
System.out.printf("daysInMonth(1,2017) = %d should be 29\n", daysInMonth(1,2020));
System.out.printf("daysInMonth(1,2017) = %d should be 30\n", daysInMonth(9,2017));
// The poverty rate for families and the number of families in poverty were
// 10.4 percent and 8.6 million in 2015,
// a decrease from 11.6 percent and 9.5 million families in 2014.
// https://www.census.gov/newsroom/press-releases/2016/cb16-158.html
//
// 40% of the residents of Flint and Detroit live in poverty.
// More than half of this population are children.
// https://poverty.umich.edu/about/poverty-facts/
System.out.println();
System.out.printf("inPoverty(10000,1) = %b should be true\n", inPoverty(10000,1));
System.out.printf("inPoverty(20000,1) = %b should be false\n", inPoverty(20000,1));
System.out.printf("inPoverty(15391,2) = %b should be true\n", inPoverty(15391,2));
System.out.printf("inPoverty(49177,9) = %b should be true\n", inPoverty(49177,9));
System.out.println();
System.out.printf("taxes(8000) = %.2f should be 800.00\n", taxes(8000));
System.out.printf("taxes(12082) = %.2f should be 955.57\n", taxes(12082));
System.out.printf("taxes(500000) = %.2f should be 150262.25\n", taxes(500000));
}
}
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