Java is smarter than me. Please help.

[SithSolo1]

===== denotes the start and end of a problem area.

public class ConsoleIOTest {
public static void main(String[] args){

System.out.println("This program is designed to calaculate how many boxes of Oaties breakfast");
System.out.println("cereal are contained in one metric ton and the weight of one box of Oaties in");
System.out.println("metric tons. It will also calculate the number of whole cases and extra boxes");
System.out.println("of Oaties in one metric ton.");
System.out.println();
System.out.println("All of this will be done using the weight you supply for one box of Oaties.");
System.out.println();
System.out.println();


double x;
x= 35273.92;

double weight;
===== Here I need to know how to ask them to enter another number if they inter a negative. As it is now it tells them to inter a positive number but it continues on with the calculations. I want it to keep asking them until they enter a positive number or until they have entered 5 or so wrong numbers. If they enter 5 or so wrong numbers I need the program to quit.
System.out.println("Please enter the weight of one box of Oaties ceral in ounces.");
System.out.println("eg.(2, 5.05, 67.2, etc):");
System.out.println();
weight= JLiveRead.readLineDouble();
System.out.println();

if (weight<0){
System.out.println("Please enter a positive number.");
}
=====
===== Here I need to know how to round up to the nearest whole number. I have no clue how I would even start to do that. This would also help on my next problem.
System.out.println("You entered " + weight + " ounces for the weight of one box of Oaties");
System.out.println();
System.out.println("There are " + x/weight
+ " boxes of Oaties in one metric ton.");
System.out.println();
System.out.println("One box of Oaties weighs " + weight/x
+ " metric tons.");
int boxes;
===== Here I need to know how show how many whole cases + extra boxes are in a metric ton. All I have so far is how many cases are in a ton.
System.out.println();
System.out.println("Please enter the number of Oaties boxes in a case.");
System.out.println("eg.(2, 5, 67, etc):");
System.out.println();
boxes= JLiveRead.readLineInt();
System.out.println();

System.out.println("You entered " + boxes + " boxes of Oaties in one case.");
System.out.println();
System.out.println("There are " + x/(boxes*weight)
+ " cases of Oaties in one metric ton.");
=====


}
}


Thx
J

If you don't feel good about doing it for me push me in the right direction with some examples.

 

[cpals]

I'm just learning Java myself, sorry can't help ya (yet). 🙂

 

[SithSolo1]

Thats cool, i got it working with the help of some nice people in the Off Topic forum.

 

[RSMemphis]

--snip The following part uses a while loop - until a positive number is entered, it will ask for a new number

weight= JLiveRead.readLineDouble();
System.out.println();

while(weight<0){
System.out.println("Please enter a positive number.");
weight= JLiveRead.readLineDouble();
}

--snip (int) casts onto an integer, but rounds down. +1 makes sure it rounds up.

System.out.println("There are " + (int)(x/weight) +1
+ " boxes of Oaties in one metric ton.");
System.out.println();
System.out.println("One box of Oaties weighs " + (int)(weight/x) +1
+ " metric tons.");

--snip

HTH

 

[Moonbender]

--snip (int) casts onto an integer, but rounds down. +1 makes sure it rounds up.

Will lead to unwanted behaviour if the user enters an integer (eg, double 4.0 will be cast to integer 4 and raised to 5).

 

[RSMemphis]

True dat...

But another if statement will take care of that.

if (((int)(x/weight))==(x/weight))
{
System.out.println("There are " + (x/weight)
+ " boxes of Oaties in one metric ton.");
}
else
{
System.out.println("There are " + (int)(x/weight) +1
+ " boxes of Oaties in one metric ton.");
}