Write a method called swappairs that accepts a string as a parameter and returns that string with each pair of adjacent letters reversed. if the string has an odd number of letters, the last letter is unchanged. for example, the call swappairs("example") should return "example" and the call swappairs("hello there") should return "all three"

answer: internal fragmentation is the difference between the (fixed) size of a memory hole and the data within in that memory. for example, if a 1,024 byte block of memory holds 800 bytes of data, then the 224 bytes difference is considered lost to internal fragmentation.

external fragmentation occurs when the sum of memory fragments is large enough to satisfy a request, but the holes are non-contiguous and the request cannot be satisfied. this can occur when memory is dynamically allocated and freed.

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