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cgi However an interface itself does nothing. All the action at least, happens inside classes.FahrToCelsiusJava is not just used for the World Wide Web. The next program demonstrates a classic use of computers that goes back to the earliest punch card machines. It's reminiscent of some of the very first useful programs I ever wrote.

cgi These were designed to quickly calculate several dozen numbers to keep me from having to do them by hand in physics lab. It's also borrowed directly from Kernighan and Ritchie. // Print a Fahrenheit to Celsius tableclass FahrToCelsius { public static void main (String args[]) { int fahr, celsius; int lower, upper, step; lower = 0; // lower limit of temperature table upper = 300; // upper limit of temperature table step = 20; // step size fahr = lower; while (fahr <= upper) { // while loop begins here celsius = 5 * (fahr-32) / 9; System.out.print(fahr); System.

cgi out.print(" "); System.out.println(celsius); fahr = fahr + step; } // while loop ends here } // main ends here} //FahrToCelsius ends here This program calculates the Celsius equivalent of Fahrenheit temperatures between zero and three hundred degrees. The first two lines of the main method declare the variables we'll use.

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