Calculations using different data types

[jlgraham]

I have an assignment that wants me to write an application that takes 5 numbers from a user. As the user inputs the numbers I have to make them into a double, float, long, int and byte. All I need after this is to output the result of the following calculation and store the result in an int variable.
Calculation to do
Subtract the floatValue from the intValue, then multiply by the doubleValue, then divide by the longValue, then multiply by the byteValue and then divide by 2. I am to store the result in an int variable. I can get the user input but am at a loss as to how to do the calculation and store the result in an int variable. Can someone out in cyberworld help? Thanks to anyone who responds.

CODE
import java.util.*;


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

Scanner input = new Scanner(System. in);

int result;

System.out.prin tln("Enter a number:");
double num1 = input.nextDoubl e();


System.out.prin tln();
System.out.prin tln("Enter second number:");
float num2 = input.nextFloat ();


System.out.prin tln();
System.out.prin tln("Enter third number:");
long num3 = input.nextLong( );


System.out.prin tln();
System.out.prin tln("Enter fourth number:");
int num4 = input.nextInt() ;


System.out.prin tln();
System.out.prin tln("Enter fifth number:");
byte num5 = input.nextByte( );


System.out.prin tln();

}

}

[JosAH]

Subtract the floatValue from the intValue, then multiply by the doubleValue, then divide by the longValue, then multiply by the byteValue and then divide by 2. I am to store the result in an int variable. I can get the user input but am at a loss as to how to do the calculation and store the result in an int variable.

That assignment text almost reads like COBOL; what is the problem? Assume
the variables are fv, iv, dv, lv and bv. The formula reads as:

(iv-fv)*dv/lv*bv/2

The result needs to be an int again so you have to cast. In Java that reads:

[code=java]
int result= (int)((iv-fv)*dv/lv*bv/2);
[/code]

kind regards,

Jos

[BigDaddyLH]

What you have to do is spelled out in detail, no?

1. Subtract the floatValue from the intValue,
2. then multiply by the doubleValue,
3. then divide by the longValue,
4. then multiply by the byteValue and
5. then divide by 2.
6. I am to store the result in an int variable.

My advice is to try to do this and post it if you still have questions.

[JosAH]

What you have to do is spelled out in detail, no?

Admit it: you programmed in COBOL too didn't you?

kind regards,

Jos ;-)

[Nepomuk]

[CODE=java]import java.util.*;

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

Scanner input = new Scanner(System. in);

int result;

System.out.prin tln("Enter a number:");
double num1 = input.nextDoubl e();

System.out.prin tln();
System.out.prin tln("Enter second number:");
float num2 = input.nextFloat ();

System.out.prin tln();
System.out.prin tln("Enter third number:");
long num3 = input.nextLong( );

System.out.prin tln();
System.out.prin tln("Enter fourth number:");
int num4 = input.nextInt() ;

System.out.prin tln();
System.out.prin tln("Enter fifth number:");
byte num5 = input.nextByte( );

System.out.prin tln();
}
}[/CODE]Hi jlgraham!
Calculations in Java aren't difficult at all. There are a lot of automatic conversions. Just make sure, you don't loose precision.
The data types you named are sorted as follows: (top being the most precise)

1. double
2. float
3. long
4. int
5. byte

For example:

Subtract the floatValue from the intValue

[code=java]float res1=num4-num2;[/code]Of course, you can use double from the beginning. You should be able to figure the rest of the calculations out yourself.

To save the result as an integer, use

int result = (int) res5;

Greetings,
Nepomuk

[jlgraham]

That assignment text almost reads like COBOL; what is the problem? Assume
the variables are fv, iv, dv, lv and bv. The formula reads as:

(iv-fv)*dv/lv*bv/2

The result needs to be an int again so you have to cast. In Java that reads:

[code=java]
int result= (int)((iv-fv)*dv/lv*bv/2);
[/code]

kind regards,

Jos

I tried this and it still will not work. I am posting the code and I still get errors. Is it because I am using the Scanner and determining the data types as the user enters them? It will not allow me to cast the result to an integer. Please help
[CODE]
import java.util.*;


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

Scanner input = new Scanner(System. in);

int result;

System.out.prin tln("Enter a number:");
double num1 = input.nextDoubl e();

System.out.prin tln();
System.out.prin tln("Enter second number:");
float num2 = input.nextFloat ();

System.out.prin tln();
System.out.prin tln("Enter third number:");
long num3 = input.nextLong( );

System.out.prin tln();
System.out.prin tln("Enter fourth number:");
int num4 = input.nextInt() ;

System.out.prin tln();
System.out.prin tln("Enter fifth number:");
byte num5 = input.nextByte( );

int result= (int)((num2 - num4) * numl / num3 * num5 / 2);

System.out.prin tln("Result is: " + result);

}

}
[CODE]

[jlgraham]

[CODE=java]import java.util.*;

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

Scanner input = new Scanner(System. in);

int result;

System.out.prin tln("Enter a number:");
double num1 = input.nextDoubl e();

System.out.prin tln();
System.out.prin tln("Enter second number:");
float num2 = input.nextFloat ();

System.out.prin tln();
System.out.prin tln("Enter third number:");
long num3 = input.nextLong( );

System.out.prin tln();
System.out.prin tln("Enter fourth number:");
int num4 = input.nextInt() ;

System.out.prin tln();
System.out.prin tln("Enter fifth number:");
byte num5 = input.nextByte( );

System.out.prin tln();
}
}[/CODE]Hi jlgraham!
Calculations in Java aren't difficult at all. There are a lot of automatic conversions. Just make sure, you don't loose precision.
The data types you named are sorted as follows: (top being the most precise)

1. double
2. float
3. long
4. int
5. byte

For example:[code=java]float res1=num4-num2;[/code]Of course, you can use double from the beginning. You should be able to figure the rest of the calculations out yourself.

To save the result as an integer, use

int result = (int) res5;

Greetings,
Nepomuk

Thank you . It worked doing one calculation at a time.

[jlgraham]

Admit it: you programmed in COBOL too didn't you?

kind regards,

Jos ;-)

I am 63 and I have never seen a programming code until I signed up for Java 1. I find it very difficult and sure have a lot of respect for you youngsters and how much you know and can do.

[JosAH]

I am 63 and I have never seen a programming code until I signed up for Java 1. I find it very difficult and sure have a lot of respect for you youngsters and how much you know and can do.

Well, I'm 51 which is a whoooole lot younger than you are of course but I'm
not exactly a youngster anymore ;-)

I appreciate it that you're taking up Java programming, I started with this
mysery (not Java) when I was 18 and computers were made of wood; my compliments.

kind regards,

Jos

[RedSon]

Well, I'm 51 which is a whoooole lot younger than you are of course but I'm
not exactly a youngster anymore ;-)

I appreciate it that you're taking up Java programming, I started with this
mysery (not Java) when I was 18 and computers were made of wood; my compliments.

kind regards,

Jos

Wood!?1 Didn't you bash little holes into stone tablets and then give them to an elephant to compile together?

[BigDaddyLH]

Wood!?1 Didn't you bash little holes into stone tablets and then give them to an elephant to compile together?

Elephant Compiler? Luxury!

[RedSon]

Elephant Compiler? Luxury!

I suppose you had a dozen monkeys with abacuses?

[JosAH]

I suppose you had a dozen monkeys with abacuses?

Abacuses? Poofter, we used the knuckles of our diseased sibblings to do our
calculations on the bottom of our lake where we lived; if our dad wouldn't beat
us; as he did every night; we had it rough ...

kind regards,

Jos ;-)