This program illustrates the use of input and output stream iterators.
First we look at output stream iterators.
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We begin by displaying the contents of an array of odd integers using the STL
copy algorithm and and an "anonymous" output stream iterator:
1 3 5 7 9
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Next we copy the values from an array of even integers into a pre-sized vector
of integers and then display the contents of the vector in the same way:
2 4 6 8 10
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Now we display the same vector contents again, this time using a named
output stream iterator which also uses a different value separator:
2 | 4 | 6 | 8 | 10 |
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Finally, we copy odd integers from an array and even integers from a vector
to an output file and then display the file to confirm. The odd integers are
output one per line.
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Here are the contents of stream_iterators.dat:
1
3
5
7
9
2 ! 4 ! 6 ! 8 ! 10 !

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Now we turn our attention to input stream iterators.
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First we read some integers entered from the keyboard, using an anonymous
input stream iterator connected to the standard input (the keyboard), and
copy those integers to a vector, then display vector contents to confirm.
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Enter 5 integers (terminate with end-of-file on a new line): 11 22 33 44 55
^Z

Here are the vector contents: 11 22 33 44 55
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Next we read some more integers entered from the keyboard, write their square
roots directly to a file, then display the file to confirm.
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Enter any number of integers on the line below and
terminate with an end-of-file on a new line:
12 34 56 78 90
^Z

Here are the contents of the file:
3.4641
5.83095
7.48331
8.83176
9.48683


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Now we read the values from the previous output file, and write the ceiling
of each value to the standard output, this time using named input and output
stream iterators.
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Here are the resulting values:
4 6 8 9 10
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Finally, we simply display the contents of the file stream_iterators.dat by
incrementing an input stream iterator connected to that file.
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Here are the values from the file:
3.4641 5.83095 7.48331 8.83176 9.48683
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