Exercise : Syntax errors

The following program contains 9 mistakes! What are they? Copy and paste the following code into jGRASP and correct the various mistakes. The answer is on the next 2 slides if you need some help.

public class Oops {
    public static void main(String[] args) {
        int x;
        System.out.println("x is" x);

        int x = 15.2;   // set x to 15.2
        System.out.println("x is now + x");

        int y;          // set y to 1 more than x
        y = int x + 1;
        System.out.println("x and y are " + x + and + y);
    }
}

answer on next slide...

Exercise - answer

line 4: missing + between "x is" and x
line 4: cannot print the value of x before assigning it a value
line 6: cannot assign 15.2 into a variable of type int
line 6: should not redeclare the variable's type
line 7: " mark should be between now and +
line 10: should not write the word int here
line 10: variable y should be same type as x
line 10: does not properly set y to be 1 more than x (should not write the word int here)
line 11: and should be in quotes with surrounding spaces

Exercise - corrected version

Here is a corrected version of the program:

public class Oops {
    public static void main(String[] args) {
        double x = 0.0;
        System.out.println("x is" + x);

        x = 15.2;       // set x to 15.2
        System.out.println("x is now " + x);

        double y;       // set y to 1 more than x
        y = x + 1;
        System.out.println("x and y are " + x + " and " + y);
    }
}