C++ - return 0 vs. return -1

Question

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What should main() return in C/C++?

In C++, return 0 tells that the program has ended successfuly.

What about return -1? Does it break (halt) the program?

score 3 · Accepted Answer · answered Jan 20 '11 at 10:57

3

Short answer: no. Returning anything except 0 just means that there was an error.

answered Jan 20 '11 at 10:57

Gemini14

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Nitpicking: eturning `EXIT_SUCCESS` also signifies success, and `EXIT_SUCCESS` can be different from 0. – Philipp Jan 20 '11 at 19:33

score 1 · Answer 2 · answered Jan 20 '11 at 10:57

No, it just sets the return_code environment variable in the shell, with which you can determine whether the program returned fine or with error when you use batch processing.

Windows:

echo %errorlevel%

POSIX:

echo $?

BTW, use EXIT_SUCCESS and EXIT_FAILURE defined in cstdlib

score 0 · Answer 3 · answered Jan 20 '11 at 11:13

0

http://www.boost.org/doc/libs/1_45_0/libs/system/doc/index.html#Acknowledgements

Here you can find nice library for system error types.

answered Jan 20 '11 at 11:13

UmmaGumma

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C++ - return 0 vs. return -1

3 Answers3