Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

In C++, use word = "learnyard" to print its size, emptiness, first and last characters, its state after push_back('.'), its restored state after pop_back(), the position of "yard", the substring "yard", and confirmation that the source remains "learnyard" after find() and substr().

size: 9
empty: false
first: l
last: d
after push_back: learnyard.
after pop_back: learnyard
find yard: 5
substr: yard
source after find and substr: learnyard