The first program of linuxC ++

The first program of linuxC ++-general Linux technology-Linux programming and kernel information. The following is a detailed description. Today, the first time I came into contact with C ++ in linux, I had a lot of problems using C ++ in windows. The error message is:
T1.cpp: In function 'int main ()':
T1.cpp: 5: Error: 'cout' has not been declared in this scope
T1.cpp: 6: Error: 'cin' has not been declared in this scope

Then the problem was solved. In the past, when c ++ calls system functions in linux, the space of this class should be referenced.
Using namespace XXXX (class space name); void cannot be used before main.
The modified code is as follows:

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