CSCI 255 — Java to C

This lab illustrates the similarities of Java and C.

Getting started using Java

Start NetBeans. Now create a project, using the menu choices FileNew Project. At the New Project window select the project type Java Application and then press Finish.

Next delete the main method and replace it with the following.

    import java.util.Scanner ;

    public static void main(String[] args) {
        Scanner termInput = new Scanner(;
        System.out.println("This is Java") ;
        System.out.println("Type in a small integer");
        int yourChoice = termInput.nextInt() ;
        for (int n = yourChoice; n>0; --n) {
            System.out.printf("%4d\n", n) ;
        System.out.println("Blastoff!") ;

Run the program and look at the output. Pretty boring.

Making C

Now we are going to write some C and C++. It won’t be as hard as you think. Start by creating a new NetBeans project. At the New Project menu create a C/C++ application within the C/C++ category.

You will need to use the little arrow on the side to specify that you are creating a C, rather than C++ or FORTRAN, application.
Choose C

Copy the contents of Java’s main method into C’s main function. Do not copy the method header! Expect NetBeans to light up your C program.

At this point, we are going to go in lecture/lab mode. There are a few things to be done here.

Making C++

Technically every C program is a C++ program, but let’s try to make a real C++ program. Again create a C/C++ application within the C/C++ category, but this time go with the default choice of C++ for the main file.

You can go ahead and replace the your C++ main with your C main. It won’t quite work, so try the following:

That should be enough to get your program to run. The only problem is that n is not being print in the field of four characters. This requires adding an include for the iomanip class, a use of the setw method, and the magic of multiple inheritence.

        cout << setw(4) << n << endl ;

Finishing up

If you are not using a computer science workstation, upload your completed program to the lab moodle page.