Computer Science Canada

NEED HELP PLZ! java integer - real program
Author:  a_vatamanescu [ Wed Nov 03, 2004 8:18 pm ]
Post subject:  NEED HELP PLZ! java integer - real program
Hey eevryone. Im stuck at a program. The user inputs a number from which i have to make the program tell him/her if its either an integer or real. How would i do that?

i tried doin this:
if (answer < 0 && answer > 0)
c.drawString ("Your number: " + answer + ".. is an integer", 250, 200);
else
c.drawString ("Your number: " + answer + ".. is real", 250, 200);

BUT IT DOESNT WORK! if i input a decimal it gives me an error!. plz help me, i really need it! Crying or Very sad
Author:  zylum [ Wed Nov 03, 2004 9:06 pm ]
Post subject: 
wheres the part of the code where you get the input?

once you get the input then you could do:

code:
if (Math.floor(number) == number) {
    System.out.println("this is an integer");
else {
    System.out.println("this is not an integer");
}
Author:  foobar247 [ Thu Nov 04, 2004 11:08 pm ]
Post subject: 
you could try making use of the string parsing functions in Integer class
so here you can test if some string can be parsed to int.

code:

try{
                Integer.parseInt(inputString);
                System.out.println("is an integer");
}
catch(NumberFormatException e){
                System.out.println("not an int");
}


i'm not sure what was the desired effect of your code. as nothing would test true.
code:
if (answer < 0 && answer > 0)

:


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