为什么 return 代码超过 255 return 在 C++ 中是不同的数字？
Why do return codes over 255 return a differnt number in C++?
例如...
#include <iostream>
using namespace std;
int main(){return 300;}
Returns:
Process finished with exit code 44
??
该标准只知道两个标准化的 return 值：EXIT_SUCCESS（或零）和 EXIT_- FAILURE：
3.6.1/5 A return statement in main has the effect of leaving the main function (destroying any objects with automatic storage duration) and
calling std::exit with the return value as the argument.
18.5/8 (...) Finally, control is returned to the host environment. If status is zero or EXIT_SUCCESS, an implementation-defined form of the status
successful termination is returned. If status is EXIT_- FAILURE, an
implementation-defined form of the status unsuccessful termination is
returned. Otherwise the status returned is implementation-defined.
因此不能保证任何其他整数按原样 returned。
在 MS Windows for example, the GetExitCodeProcess() 函数中 return 是整数值，因此您将得到 300。
关于POSIX compliant systems, like Linux，规则是("only the 8 least significant bits (i.e. status & 0377) shall be available to the awaiting parent process")。所以对于 300，它将是 44。
例如...
#include <iostream>
using namespace std;
int main(){return 300;}
Returns:
Process finished with exit code 44
??
该标准只知道两个标准化的 return 值：EXIT_SUCCESS（或零）和 EXIT_- FAILURE：
3.6.1/5 A return statement in main has the effect of leaving the main function (destroying any objects with automatic storage duration) and calling
std::exitwith the return value as the argument.18.5/8 (...) Finally, control is returned to the host environment. If status is zero or
EXIT_SUCCESS, an implementation-defined form of the status successful termination is returned. If status isEXIT_- FAILURE, an implementation-defined form of the status unsuccessful termination is returned. Otherwise the status returned is implementation-defined.
因此不能保证任何其他整数按原样 returned。
在 MS Windows for example, the GetExitCodeProcess() 函数中 return 是整数值，因此您将得到 300。
关于POSIX compliant systems, like Linux，规则是("only the 8 least significant bits (i.e. status & 0377) shall be available to the awaiting parent process")。所以对于 300，它将是 44。