COMPUTER PROGRAMMING
Lab(7)
Exercise 1
(Decimal to hex) Write a program that prompts the user to enter an integer
between 0 and 15 and displays its corresponding hex number. Here are some
sample runs:
Source code:
import java.util.Scanner;
public class lab7_1 {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a decimal value (0 to 15): ");
int decimal = input.nextInt();
if (decimal > 15 || decimal < 0)
System.out.println("Invalid input");
else if (decimal < 10)
System.out.println("The hex value is " + decimal);
else
System.out.println("The hex value is " + (char)('A' + decimal - 10));
}
}
Output:
Exercise 2
(Financial: compare costs) Suppose you shop for rice in two different packages.
You would like to write a program to compare the cost. The program prompts the
user to enter the weight and price of the each package and displays the one with
the better price. Here is a sample run:
Source code:
import java.util.Scanner;
public class Lab7_2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter weight and price for package 1: ");
double weight1 = input.nextDouble();
double price1 = input.nextDouble();
System.out.print("Enter weight and price for package 2: ");
double weight2 = input.nextDouble();
double price2 = input.nextDouble();
if (price1 * 1.0 / weight1 >= price2 * 1.0 / weight2)
System.out.println("Package 1 has the best price.");
else
System.out.println("Package 2 has the best price.");
}
}
Output:
Exercise 3
(Find the Largest Number) The process of finding the largest value is used frequently
in computer applications. Write a program that reads 3 integers from the console and
print the largest integer between them. Here is a sample run:
Source code:
Scanner input = new Scanner(System.in);
System.out.print("Enter the first integer: ");
int x = input.nextInt();
System.out.print("Enter the second integer: ");
int y = input.nextInt();
System.out.print("Enter the third integer: ");
int z = input.nextInt();
if ( x > y && x > z )
System.out.println("The largest number between ["+x+","+y+","+z+"] is "+ x);
else if ( y > x && y > z )
System.out.println("The largest number between ["+x+","+y+","+z+"] is "+ y);
else if ( z > x && z > y )
System.out.println("The largest number between ["+x+","+y+","+z+"] is "+ z);
else
System.out.println("Entered numbers are not distinct");
Output: