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Putting using namespace std within your program is generally a bad habit that you'd do well to avoid.

Anything with a leading underscore is a reserved name in C++ (and in C). See this question for details.

Putting using namespace std within your program is generally a bad habit that you'd do well to avoid.

Anything with a leading underscore is a reserved name in C++ (and in C). See this question for details.

In order to compile and link, this code requires the following three lines:

In order to compile and link, this code requires the following lines:

In order to compile and link, this code requires the following two lines:

In order to compile and link, this code requires the following three lines: