Unit 3 Hw - Even Questions/FRQ
Question 2
import java.util.*;
public class Quadratic {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
double a = sc.nextDouble();
System.out.println(a);
double b = sc.nextDouble();
System.out.println(b);
double c = sc.nextDouble();
System.out.println(c);
double quadratic1 = (-1*b + Math.sqrt(b*b-4*a*c))/2*a;
double quadratic2 = (-1*b - Math.sqrt(b*b-4*a*c))/2*a;
System.out.println(quadratic1 + " or " + quadratic2);
}
}
Quadratic.main(null);
Question 4
import java.util.*;
public class Sign {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Input number - ");
double input = sc.nextDouble();
System.out.println(input);
if (input < 0) {
System.out.println("Negative");
}
else if (input > 0) {
System.out.println("Positive");
}
else {
System.out.println(0);
}
}
}
Sign.main(null);
Question 6
import java.util.*;
public class Round {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Input number - ");
double input1 = sc.nextDouble();
System.out.println(input1);
System.out.print("Input number - ");
double input2 = sc.nextDouble();
System.out.println(input2);
input1 = Math.round(input1 * Math.pow(10, 3)) / Math.pow(10, 3);
input2 = Math.round(input2 * Math.pow(10, 3)) / Math.pow(10, 3);
if (input1 == input2) {
System.out.println("They are the same");
}
else {
System.out.println("They are different");
}
}
}
Round.main(null);
Question 8
import java.util.*;
public class Letter {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Input character - ");
String input1 = sc.next();
System.out.println(input1);
if (input1.equals("a") || input1.equals("e") || input1.equals("i") || input1.equals("o") || input1.equals("u") || input1.equals("y")) {
System.out.println("Character is a vowel");
}
else {
System.out.println("Character is a consonant");
}
}
}
Letter.main(null);
Question 10
public class Natural {
public static void main (String[] args) {
System.out.print("The first 10 natural numbers :");
System.out.println(" ");
for(int num = 1; num < 11; num++) {
System.out.println("Enter")
System.out.println(num);
int input = sc.nextInt();
}
}
}
Natural.main(null);
Question 12
import java.util.*;
public class Mean {
public static void main (String[] args) {
int n=0;
int s=0;
int average = 0;
System.out.println("Input number :");
for (int i = 0; i < 5; i++) {
Scanner sc = new Scanner(System.in);
n = sc.nextInt();
System.out.println(n);
s += n;
}
average = s/5;
System.out.println("Sum is " + s);
System.out.println("Average is " + average);
}
}
Mean.main(null);
Question 14
import java.util.*;
public class Multiplication {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Input number :");
int input = sc.nextInt();
int product = 0;
for (int i = 0; i < 6; i++) {
product = input * i;
System.out.println(input + "*" + i + "=" + product);
}
}
}
Multiplication.main(null);
Question 16
import java.util.*;
public class Pyramid {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input for number of rows");
int input = sc.nextInt();
for (int i = 0; i < input; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(j);
}
System.out.println(" ");
}
}
}
Pyramid.main(null);
Question 18
import java.util.*;
public class Triangle {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input for number of rows");
int input = sc.nextInt();
int k = 1;
for (int i = 1; i < input; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(k++);
}
System.out.println(" ");
}
}
}
Triangle.main(null);
Question 20
import java.util.*;
public class Triangle2 {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input for number of rows");
int input = sc.nextInt();
int k = 1;
for (int i = 1; i < input; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(k++);
System.out.print(" ");
}
System.out.println(" ");
}
}
}
Triangle2.main(null);
2019 FRQ 1 A
public static int numberOfLeapYears(int year1, int year2) {
int count = 0;
for (int i = year1; i <= year2; i++) {
// add to count if year is leap year
if (isLeapYear(i)) count++;
}
return count;
}
2019 FRQ 1 B
public static int dayOfWeek(int month, int day, int year) {
int day = firstDayOfYear(year) + dayOfYear(month, day, year) - 1;
// only 7 days in a week
return day % 7;
}