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C language: 9. Return in main function
2022-07-27 19:33:00 【Brother rabbit head】
stay c In language main Functional return 0; Corresponding to correct execution
For example, execute the following command 
linux In the system , Use echo $? If the result is not 0, It means that the execution of the last command failed , Will return an error code , The error code in the above figure is 154
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