小编And*_*ana的帖子

考虑下面的C++代码:

int _tmain(int argc, _TCHAR* argv[])
{
    int by = 10;
    printf("%d\n", by);

    int bx = 20;
    printf("%d\n", (by + bx));

    return 0;
}

哪个工作正常.有趣的是"by"变量.如果我尝试为包含by的简单表达式添加监视,则结果将为CXX0030:错误:无法计算表达式.

例如,在断点上return 0,如果我添加以下手表,我会得到提到的结果:

by : 10
bx : 20
by + 5 : CXX0030: Error: expression cannot be evaluated
bx + 5 : 25
by + bx : CXX0030: Error: expression cannot be evaluated
(by) + bx : 30
by + (bx) : CXX0030: Error: expression cannot be evaluated
bx + (by) : CXX0014: …