While loop program

[DevMcg123]

Plz help. I am a rookie in Java programming and have a question on how to go by doing a while loop program.

Write a program which reads in the base and altitude of a triangle, computes the area, and prints the base, altitude and area of each in good form. Continue until the user enters a "-1" for the base.

I know the output is suppose to look like this:
Tri base altitude area
1 ## ## ##
2 ## ## ##

Thanks.

[Norm]

Break the project up into small easy steps:
First don't worry about getting the input, just hard code it in variables:
int base = 10;
int altitude = 20;
etc
Then compute the area and print it out

Next write a program that gets those values from the user, one at a time.

[Hack]

Welcome to DevX

We are more than happy to help you help yourself. What code do you have so far that doesn't seem to be working for you?

[DevMcg123]

Here is what ive done so far

 import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class triangles {
	public static void main(String[] args )throws IOException {
		
		InputStreamReader reader = new InputStreamReader (System.in);
		BufferedReader buffer = new BufferedReader(reader);
		
		int area;
		int base;
		int altitude;
		int triangle;
		
		System.out.print("Enter base of triangle:\n");
		base = Integer.valueOf(buffer.readLine()).intValue();
		
		System.out.print("Enter number triangle:\n");
		triangle = Integer.valueOf(buffer.readLine()).intValue();
		
		
		System.out.print("Enter altitude of triangle:\n");
		altitude = Integer.valueOf(buffer.readLine()).intValue();
		
		
		area = 1/2 * base * altitude;
		
		while(base <= 1){
			System.out.println("trangle      base     altitude   area ");
			System.out.println("-------      ----     --------   ----");
			System.out.println(+ triangle + "" + base + "" + altitude + "" + area); 
			
			base = base + 1;
			
			
			}
		}		
	}

[Hack]

What kind of output are you getting?

Are you receiving any errors?

[Clarox]

Here is what ive done so far

System.out.print("Enter base of triangle:\n");
base = Integer.valueOf(buffer.readLine()).intValue();

System.out.print("Enter number triangle:\n");
triangle = Integer.valueOf(buffer.readLine()).intValue();

System.out.print("Enter altitude of triangle:\n");
altitude = Integer.valueOf(buffer.readLine()).intValue();

You probably want to put that inside the while loop. Also, you can use a counter for the triangle # instead of asking the user to enter it.

area = 1/2 * base * altitude;

Your area, base, and altitude variables are integers. Are you sure you don't want floats or longs? Also, I'd rewrite that as

area = base * altitude / 2

[Hack]

you can use a counter for the triangle # instead of asking the user to enter it.

I'm guessing that rather than 0 he would want a user input starting point.

[harshira]

its better to use do - while that while.
then your code will look like :

do{

if(base == -1 || altitude == -1 ||  height == -1)
break;
// find area
}while(true)