This program illustrates comparison of pair objects.
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First we create the following pair objects:
pair<char, int> pair1('A', 10);
pair<char, int> pair2('B', 5);
pair<char, int> pair3('B', 10);
pair<char, int> pair4('B', 10);
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Next we compute the values of some comparisons.
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pair1 <   pair2 = true
pair1 >=  pair2 = false
pair2 <   pair3 = true
pair2 >=  pair3 = false
pair3 ==  pair4 = true
pair3 !=  pair4 = false
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