More Exercises
Exercise - Swap Numbers

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public class Main {
public static void main(String[] args) {
int num1 = MyConsole.readInt("enter 1st int: ");
int num2 = MyConsole.readInt("enter 2nd int: ");
int temp = num1;
num1 = num2;
num2 = temp;
System.out.println("After swaping:" + " num1 = " + num1 + ", num2 = " + num2);
}
}
enter 1st int: 100
enter 2nd int: 15
After swaping: num1 = 15, num2 = 100
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public class Main {
public static void main(String[] args) {
int num1 = MyConsole.readInt("enter 1st int: ");
int num2 = MyConsole.readInt("enter 2nd int: ");
num1 = num1 + num2;
num2 = num1 - num2;
num1 = num1 - num2;
System.out.println("After swaping:" + " num1 = " + num1 + ", num2 = " + num2);
}
}
enter 1st int: 100
enter 2nd int: 15
After swaping: num1 = 15, num2 = 100
××”×ר:
input: num1=100, num2=15
num1 = num1 + num2; //(num1: 115) = 100 + 15
num2 = num1 - num2; //(num2: 100) = 115 - 15
num1 = num1 - num2; //(num1: 15) = 115 - 100
Exercise - Print Digits
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public class Main {
public static void main(String[] args) {
int num = MyConsole.readInt("enter 3-digit int: ");
if (num>100 && num<1000){
int singles = num % 10;
int tens = num / 10 % 10;
int hundreds = num / 100;
System.out.println(hundreds);
System.out.println(tens);
System.out.println(singles);
System.out.println("sum is: "+ (singles+tens+hundreds));
} else {
System.out.println("not valid number");
}
}
}
enter 3-digit int: 567
5
6
7
sum is: 18
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Exercise - Clock

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import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter seconds: ");
int seconds_input = scanner.nextInt();
int hours = seconds_input / 3600;
int minutes = (seconds_input / 60) % 60 ;
int seconds = seconds_input % 60;
System.out.print("hours: " + hours);
System.out.print(", minutes: " + minutes);
System.out.print(", seconds: " + seconds + "\n");
}
}
Enter seconds: 3669
hours: 1, minutes: 1, seconds: 9
Exercise - Roots of a quadratic equation

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import java.util.Scanner;
public class Main {
public static void main(String[] args) {
double secondRoot = 0, firstRoot = 0;
Scanner sc = new Scanner(System.in);
System.out.print("Enter the value of a: ");
double a = sc.nextDouble();
System.out.print("Enter the value of b: ");
double b = sc.nextDouble();
System.out.print("Enter the value of c: ");
double c = sc.nextDouble();
double determinant = (b*b)-(4*a*c);
double sqrt = Math.sqrt(determinant);
if(determinant>0){
firstRoot = (-b + sqrt)/(2*a);
secondRoot = (-b - sqrt)/(2*a);
System.out.println("Roots are: "+ firstRoot +" and "+secondRoot);
}else if(determinant == 0){
System.out.println("Root is : "+(-b + sqrt)/(2*a));
}
}
}
Enter the value of a: 1
Enter the value of b: -1
Enter the value of c: -6
Roots are: 3.0 and -2.0
Exercise -Check if point is in radius of (x,y)
Hint: use Pythagorean theorem פ××Ŗ××רה

import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
//circle
System.out.print("Enter x of circle: ");
double x = sc.nextDouble();
System.out.print("Enter y of circle: ");
double y = sc.nextDouble();
System.out.print("Enter radius: ");
double radius = sc.nextDouble();
//point
System.out.print("Enter x of point: ");
double x_point = sc.nextDouble();
System.out.print("Enter y of point: ");
double y_point = sc.nextDouble();
//calculation
double delta_x = x - x_point;
double delta_y = y - y_point;
double distance = Math.sqrt(Math.pow(delta_x, 2) + Math.pow(delta_y, 2));
if (distance < radius)
System.out.println("Point is inside circle");
else if (distance == radius)
System.out.println("Point is on the circles perimeter");
else
System.out.println("Point is outside circle");
}
}
Enter x of circle: 6
Enter y of circle: 0
Enter radius: 5
Enter x of point: 3
Enter y of point: -4
Point is on the circles perimeter
another run
Enter x of circle: 0
Enter y of circle: 0
Enter radius: 5
Enter x of point: 5.1
Enter y of point: 0
Point is outside circle
Exercise - Rotate Square
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