$2\mathrm{.}8$ LAB: Caffeine levels

LAB

ACTIVITY

$2\mathrm{.}8\mathrm{.}1$: LAB: Caffeine levels

$\frac{0}{10}$

A half$-$life is the amount of time it takes for a substance or entity to fall to half its original value. Caffeine has a half$-$life of about $6$ hours

in humans. Given caffeine amount $($in mg $)$ as input, output the caffeine level after $6,12,$ and $24$ hours.

Output each floating$-$point value with two digits after the decimal point, which can be achieved as follows:

System.out.printf$("$After $6$ hours: $8\mathrm{.}2$f mg

$",$ yourValue$)$;

Ex: If the input is:

the output is:

After $6$ hours: $50\mathrm{.}00mg$

After $12$ hours: $25\mathrm{.}00mg$

After $24$ hours: $6\mathrm{.}25mg$

Note: A cup of coffee has about $100$ mg $.$ A soda has about $40$ mg $.$ An "energy" drink $($a misnomer$)$ has between $100$ mg and $200$ mg $.$

LabProgram.java

$1$ import java.util. Scanner;

$3$ public class LabProgram $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($System$.$ in$)$;

double caffeineMg; $//$ "double" supports floating$-$point like $75\mathrm{.}5,$ versus int for integers like $75.$