Top or None

Write a function string topOrNone(const stack<int>& s). If the stack is empty, return the string none. Otherwise return the top element converted to a string with to_string.

The tests print the returned string on its own line: for a stack whose top is 7 the output is 7, and for an empty stack the output is none.

Do NOT write a main function.

Expected Output:

7↵
none↵

= newline. The output ends with a newline — print one after the last line.

Hints3 available

Topics:

STL ContainersStacks

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