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swapPairs

Language/Type: C++ string return
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Author: Marty Stepp (on 2016/06/16)

Write a function named swapPairs that accepts a string reference as a parameter and modifies that string so that each pair of adjacent letters will be reversed. If the string has an odd number of letters, the last letter is unchanged. For example, if a string variable s stores "example", the call of swapPairs(s); should change the string to "xemalpe". If s had been "hello there", the call would produce "ehll ohtree".

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This is a function problem. Write a C++ function as described. Do not write a complete program; just the function(s) above.

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