Sami_Darkangel - 1 year ago 105

Java Question

I just started learning how to program in Java. Everything was going well so far.. That was until I came across this "bonus" question/problem our teacher gave us to solve as an additional "challenge".

Please click here to view the Question and the Sample input/output (it's an image file)

Note that I'm not allowed to use anything that wasn't taught or discussed in class. So, things like arrays, method overloading, parsing arrays to methods, parseInt, etc. gets ruled out.

Here's what I was able to come up with, so far:

`import java.util.Scanner;`

public class Test

{

public static void main(String[] args)

{

int N; // number of lines of input

double length1, length2, length3; // the 3 lengths

double perimeter; // you get this by adding the 3 lengths

double minperimeter=0; // dummy value

Scanner input = new Scanner(System.in);

System.out.println("Enter the number of triangles you have:");

N = input.nextInt();

System.out.println("Insert the lengths of the sides of these " +

"triangles (3 real numbers per line):");

for (int counter=0; counter<N; counter++)

{

length1 = input.nextDouble();

length2 = input.nextDouble();

length3 = input.nextDouble();

perimeter = (length1 + length2 + length3);

minperimeter = Math.min(perimeter,Math.min(perimeter,perimeter));

}

System.out.printf("The minimum perimeter is %.1f%n", minperimeter);

}

}

The ones before it get

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Answer Source

`Math.min(perimeter,perimeter)`

will always give you `perimeter`

. You probably wanted to do `Math.min(perimeter,minPerimeter)`

Since it's a programming assignment is best if I don't give you the full solution to your second question, but your hint is, in the `counter`

parameter of your for loop. Save that when you update `minperimeter`

, so that you know in which iteration of the loop you found the minimum.

Also, initialise your minPerimeter to 10000 or higher. If you start at 0, Math.Min will never be lower than that.

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