Please Help!!!

**Avthar** · 03-05-2011, 06:03 PM

Hi

I am trying to compare 3 values and output the largest.
I tried the methods in the Math class, but it did not work as it only compared 2 values- i.e the "Math.max(x,y)" one. Now im trying to compare them using a if statement but have run into a dead end...

Help and a solution would be much appreciated..

here is my code:

import java.util.Scanner;
public class ExB_8
{
public static void main(String[]args)
{
Scanner scan = new Scanner (System.in);

double n1, n2, n3;

System.out.println("Enter number 1:");
n1= scan.nextDouble();

System.out.println("Enter number 2:");
n2= scan.nextDouble();

System.out.println("Enter number 3:");
n3= scan.nextDouble();

if (n1>n2) and (n1>n3)
System.out.println("Largest number is:"+ n1);

if (n2>n1) and (n2>n3)
System.out.println("Largest number is:"+ n2);

if (n3>n2) and (n3>n1)
System.out.println("Largest number is:"+ n3);

jGRASP: operation complete.
ÏÏÏÏ
ÏÏ«Ï ----jGRASP exec: javac -g ExB_8.java
ÏÏ§Ï
Ï¼§ÏExB_8.java:20: ';' expected
ÏÏ§Ï if (n1>n2) and (n1>n3)
ÏÏ§Ï ^
Ï¼§ÏExB_8.java:23: ';' expected
ÏÏ§Ï if (n2>n1) and (n2>n3)
ÏÏ§Ï ^
Ï¼§ÏExB_8.java:26: ';' expected
ÏÏ§Ï if (n3>n2) and (n3>n1)
ÏÏ§Ï ^
ÏÏ§Ï3 errors
ÏÏ§Ï
ÏÏ§Ï ----jGRASP wedge2: exit code for process is 1.
ÏÏ©Ï ----jGRASP: operation complete.

**YAY** · 03-05-2011, 06:07 PM

Don't use

Java Code:

if (n1>n2) and (n1>n3)

use

Java Code:

if((n1>n2) && (n1>n3))

and use [ CODE ][ /CODE ]

**sunde887** · 03-05-2011, 06:10 PM

Your if statements seem incorrect.

Java Code:

if(condition1 && condition2){
  //do something
}

You could use math.max however through, what happens if you nest them?

Also, a more reusable approach is to store the inputs in an array and use a loop and an if statement to determine the largest number.

**Avthar** · 03-05-2011, 06:15 PM

Hi

Thanks for the help.
Will try it and see if it works

Thanks alot

**Avthar** · 03-05-2011, 06:16 PM

By the way, does anyone know where i can get a good, free, C++ Java Tutorial for beginners, something thats comprehensive, yet easy to follow...

Thanks again

**Fubarable** · 03-05-2011, 06:17 PM

What is a "C++ Java Tutorial"?

Are you looking for a C++ tutorial?
A Java tutorial?
One combined??

**Skiller** · 03-05-2011, 06:18 PM

I don't think "and" is a keyword in Java, what you are looking for is the logical and operator which is two ampersands (&&). You also need to place all the comparisons inside of a set of brackets so your if statements would look more like:

Java Code:

if ((n1>n2) && (n1>n3))

You can also use a call to the math function as a parameter of another call to the math function like the following to compare 3 values:

Java Code:

maxValueOfXYZ = Math.max(Math.max(x,y),z);

Hope that helps :)

Edit:
Damn I'm a slow typist, to much revising and checking what I say ;)

**Avthar** · 03-05-2011, 06:26 PM

@Fubarable

I'm very new to Programming and my teacher is teaching us in C++. But he hasnt gone through all the basics, like "What is a class or method" etc. Instead, he teaches us how to translate Pseudo Code to C++, so i want something that can guide me through the basics...

**sunde887** · 03-05-2011, 06:29 PM

So you are looking for a c++, tutorial. This is different than java, they are two entirely different languages.

**Avthar** · 03-05-2011, 06:33 PM

Yes, a C++ Tutorial.

**sunde887** · 03-05-2011, 06:39 PM

This is a java forum so you may not get much help with that question. However; I will suggest cprogramming.com, or, if you have a textbook for your class, read it.