#Output is wrong

1 messages · Page 1 of 1 (latest)

fossil pumice
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I was trying to calculate the area of circle and volume of sphere.I entered the radius and it showed the wrong answer. I had also typed the syntax correct than to also it was showing wrong. Pls someone help me

tribal daggerBOT
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<@&987246399047479336> please have a look, thanks.

tribal daggerBOT
#

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austere marten
fossil pumice
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System.out.println(" Area of circle = " + carea); ```
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This is for area of circle

scarlet estuary
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It looks like the 22/7 is integer division, so the decimal there is being lost. Is r also an int by chance?

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When you divide ints in Java, the result is also an int (Java just scraps the decimal if there is one).

fossil pumice
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I have declared r as an double

scarlet estuary
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Oh okay.

fossil pumice
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And the 22/7 is the value of π

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The formula is πr²

scarlet estuary
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I'm not sure what the current output is but I'm assuming the issue is with the 22/7. Can you try making one of those a double value to see if it keeps the decimal? Like this:java carea=(22d/7)*r*r; System.out.println(" Area of circle = " + carea);(The d suffix makes the number 22 a double value instead of just an int.)

scarlet estuary
fossil pumice
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It means I need to initialise d=22;

fossil pumice
scarlet estuary
fossil pumice
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I am actually having my dinner

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Can I send you later?

scarlet estuary
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That's okay.

scarlet estuary
fossil pumice
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Ok

fossil pumice
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Here is the code

true ruin
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You didn't use the discussed double cast. I dont think you're following what he meant by integer division.
Also you're told to use 22/7 and not the predefined Math.PI? (3.1415926....)

fossil pumice
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I used 22/7 only

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Help me

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I have to complete this by tomm

fossil pumice
tidal fulcrum
fossil pumice
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I can't

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I am supposed to use the given value

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The value given is 22/7

ruby marlin
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is the output still wrong ?

true ruin
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Its definitely wrong because 22/7 = 3

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Integer division truncates any decimals (which would be obtained with modulus (%) )

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You need to cast it to a double or use a double literal such as 22.0

ruby marlin
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or 22d

true ruin
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22.0 / 7 or 22d / 7 will convert both operands to doubles and perform 22.0 / 7.0 which gives a floating point answer

fossil pumice
ruby marlin
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no if u place a d behind an int, it will be treated as a double

true ruin
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? d is the literal syntax to denote a double

fossil pumice
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I will try

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Can I use import java.math.*;

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For int calculations

true ruin
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What int calculation do u need from that?

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like Math.pow()?

fossil pumice
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No

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At the starting

true ruin
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if you're referring to the top of the file, that is where imports go, yes, but why do you need the math library

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Also java.math.* are math classes like BigInteger. java.lang.Math* is the math constants

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int/double division examples:

        double r = 4;
        //Incorrect calculations
        System.out.println(22/7 * r * r); //wrong
        System.out.println((double)(22/7) * r * r); //wrong
        // The following are correct division
        System.out.println(22d/7 * r * r);
        System.out.println(22.0/7 * r * r);
        System.out.println(22/7d * r * r);
        System.out.println(22/7.0 * r * r);
        System.out.println((double) 22/7 * r * r);
        System.out.println(22/(double)7 * r * r);
        System.out.println((double) 22/7 * r * r);```
fossil pumice
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Ok I will try any of these

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Thank you

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For helping

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If still prblm appears what to do ?

fossil pumice
true ruin
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Yeah

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Its just the pi part thats messed up

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That r=4 is a placeholder

fossil pumice
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Thank you

fossil pumice
tribal daggerBOT
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Closed the thread.

fossil pumice
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Hello

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My output is again coming wrong for another question

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Not the area & volume one

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My program is to calculate relative velocity and time taken to cross

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The output coming was velocity as 0.0 and time as infinity

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Here is the code

keen roost
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@fossil pumice use the snipping tool to take screenshots

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not your phone

fossil pumice
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Ye

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But now help me

tulip timber
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the image is not readable on mobile for example

fossil pumice
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Ok

scarlet estuary
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It looks like the default label does not apply to any statement.

fossil pumice
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Lemme type

fossil pumice
scarlet estuary
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Ah, nevermind. It's not.

fossil pumice
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It's not a compilation error

scarlet estuary
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I suppose there's special syntax for switch blocks that lets you write a default or case label at the very end.

fossil pumice
scarlet estuary
fossil pumice
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In my 2 yr experience I have only studied switch(variable),case, default,break syntax

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For switch case prgms

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In other prgms it's showing correct output by adding default:

# 
{
    case '1' :
    speed=Math.abs(s1-s2);
    break;
    case '2' :
    speed=s1+s2;
    break;
    default:
} ```
fossil pumice
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Actually I have taken choice as integer

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Should I take string for choice ?

true ruin
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U shouldnt compare an int to a char. '1' is a char and will be converted to the ascii value

fossil pumice
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Ok

austere marten
fossil pumice
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The latest one

austere marten
fossil pumice
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Can you give me the another switch

austere marten
fossil pumice
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I put speed as 50

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For train 1

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And for train 2 it's 40

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Should I give question

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?

austere marten
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switch(choice){
    case '1' -> speed = Math.abs(s1-s2);
    case '2' -> speed = s1+s2;
    default -> {}
}

Or better :

speed = switch(choice){
    case '1' -> Math.abs(s1-s2);
    case '2' -> s1+s2;
    default -> speed;
}
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@fossil pumice

fossil pumice
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I am back

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I got my prblm

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I have resolved

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Thank you for helping me

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Actually I had declared choice as an integer

tribal daggerBOT
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Closed the thread due to inactivity.

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