Sample Code
Escape Characters
| Escape Sequence | Character |
| \n | newline |
| \t | tab |
| \b | backspace |
| \” | double quote |
| \’ | single quote |
| \\ | backslash |
| \uDDDD | Unicode character |
public class uni
{
public static void main (String args [])
{
System.out.println("\u0041");
}
}
Simple Scanner
import java.util.Scanner;
public class Simpscan
{
public static void main (String args [])
{
System.out.println("Enter your name");
Scanner scan = new Scanner(System.in);
String s = scan.next();
System.out.println("Hello " + s);
}
}
System.out.format
double pi = 3.1415;
System.out.format("Pi is %f to 4 d.p.%n", pi);
#+RESULTS
Pi is 3.141500 to 4 d.p.
Exercise
- Use the \t escape character to print out a noughts and crosses grid, as shown below in fig. 1
- Prompt the user to enter their (name). Print out “Hello” (name) “I hope you’re well”
- Use Math.sqrt() to print out the square root of 20
- Use Math.sqrt() to print out the square root of 20 to 2 decimal places
- Use Math.random() to print out a random integer between 5 and 10
- Use Math.pow() to print out 2 to the power of 8
- Prompt the user to enter a (number). Print out “The square root of ” (number) ” is ” (answer)
- Prompt the user to enter two numbers. Print out the average of those numbers.
- To work out your BMI, divide your weight in kilograms by your height in metres squared. In other words BMI = w / h*h. Write a program that prompts the user to input their weight and height, and then outputs their BMI.
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Tony Ballantyne Tech 