$($In c$++)$

Reading to EOF

Input streams $($like std::cin $)$ can be used as predicates $($bools$)$ to see if

they are in an error state. One such error state is having no more data to

read in$.$ So an expression like this,

while $($std::cin$)\{$

$...$

$\}$

will loop until cin has nothing more to read. The expression cin $$

extracts a value from the stream and puts it in $,$ but it also returns

So this statement:

while $($std::cin $>>$x$)\{$

$...$

$\}$

will keep replacing $x$ with the next value from a stream until the stream

is exhausted.

When you are testing your code by compiling and running it$,$ the above

example will run until you specify that there is no more input. This is

called the EOF $($End$-$Of$-$File$).$ Typing Control$-$d into the terminal sends

this message.

Write a program in EOF$\_$Sum$/$main$.$CPD that reads in integers from the

standard input stream until there are no more values. Print the sum of

those integers.

Example input:Write a program in Metric$/$main$.$cpp that reads pairs of metric distances $($mm$,$ cm$,$ m$,$ or km$)$ from the standard input stream until there are no more values. For each pair, print if the first distance is larger than the second.

Example input:

$10$mm $14$mm

$14$mm $10$mm

$12$mm $12$mm

$1$cm $10$mm

$12$cm $99$mm

$12$cm $200$mm

$1$km $5677$m

$100000$cm $1000$m

Expected output:

$10$mm is smaller than $14$mm

$14$mm is larger than $10$mm

$12$mm is the same as $12$mm

$1$cm is the same as $10$mm

$12$cm is larger than $99$mm

$12$cm is smaller than $200$mm

$1$km is smaller than $5677$m

$100000$cm is the same as $1000$m