Thread: Java problem

write a program to ask the user to enter 3 numbers called num1, num2 and num3. The program should print "Two larger" if num2 and num3 are both larger than 15. Else if num2 is between 5 and 10, inclusive, then print "In between" Otherwise print "Don't know".

Sample output
Enter first number: 2
Enter second number: 15
Enter third number: 34
Two larger

Instead i keep getting Don't know. I suspect it has something to do with the inclusive?

public static void main(String[] args) {
int num1 = 0;
int num2 = 0;
int num3 = 0;

Scanner sc = new Scanner (System.in);
System.out.println ("Enter first number: ");
num1 = sc.nextInt();
sc.nextLine();

System.out.println ("Enter second number: ");
num2 = sc.nextInt();
sc.nextLine();

System.out.println ("Enter third number: ");
num2 = sc.nextInt();
sc.nextLine();

if (num2>15 && num3>15)
{
System.out.println ("Two larger");
}
else if (num2>=5 && num2<=10)
{
System.out.println ("In between");
}
else
{
System.out.println ("Don't know");


}
}

}

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Please post your code correctly per the above link.

Your assignment doesn't make sense the way you've explained it. Why 3 numbers? num1 is irrelevant. Why the comparisons to 15, 5, and 10? Maybe it's just a nonsensical exercise, but we can't be sure if it's that or whether your understanding and explanation of it are lacking.

I'm suppose to get the output of two larger if i enter 2 for first number, 15 for second and 34 for third.
using the if else method. But instead i'm getting don't know which is not the result the worksheet wanted me to get. I don't see what i do wrong here..really.

If this is your sample input:

Enter first number: 2
Enter second number: 15
Enter third number: 34

Then you should generate a "Don't know" response, correct?

here's the problem. If i complete the java code for the following question. I'm getting "Don't know" respond even though i'm suppose to get a "Two larger" respond from the system.

The question is this
write a program to ask the user to enter 3 numbers called num1, num2 and num3. The program should print "Two larger" if num2 and num3 are both larger than 15. Else if num2 is between 5 and 10, inclusive, then print "In between" Otherwise print "Don't know".

Output
Enter first number: 2
Enter second number: 15
Enter third number: 34
"Two larger"

The issue is here:

if (num2>15 && num3>15) {
System.out.println ("Two larger");
}

With your inputs you're asking if (15>15 && 34>15), but 15 is not greater than 15, it is equal. If you need this input set to give the "Two larger" response, change the if statement to

if (num2>=15 && num3>=15) {
System.out.println ("Two larger");
}

Would like to thank DuncanS, Cornix and mod for the help.

Although i got the output i wanted, i still need some clarification. Based on the question, shouldn't the code be
if num2 and num3 are both larger than 15. if (num2>15 && num3>15) are both larger so why are we still using = sign? since it should be larger than 15.

Else if num2 is between 5 and 10, else if (num2>=5 && num2<=10) as in >= <= are only used for "in between" "range"

>= and <= are used when you need an inclusive set. if (num2>=5 && num2<=10) will return true for the set { 5, 6, 7, 8, 9, 10 }, whereas if (num2>5 && num2<10) will return true for the set { 6, 7, 8, 9 }.

Similarly, if (15 > 15) will return false, while if (15 >= 15) will return true. If you want to keep the original assertion that "The program should print "Two larger" if num2 and num3 are both larger than 15", you need inputs that reflect that assertion, since setting num2 or num3 to be equal to 15 with this assertion will always return "Don't know".