问题描述
我有一个for循环，其中定义了所有变量
I have a for loop that has all variables defined
#pragma omp parallel for
for(long long l = 1; l<=sqrtt; l++) ...
code> / openmp 命令行选项在Visual Studio 2012中，它给我
When I compile this with the /openmp command line option in Visual Studio 2012, it gives me
error C3017: termination test in OpenMP 'for' statement has improper form
我不知道为什么'for'语句有不正确的形式
I don't know why 'for' statement has improper form.
对于OpenMP的语句，如何将其应用于我的for循环？
What is a proper for statement to OpenMP? How do I apply it to my for loop?
推荐答案
标准为 for-loop 构造规定了非常严格的格式（参见第39页）：
The OpenMP 3.1 standard prescribes a very strict form for the for-loop construct (see pag.39):
for (init-expr; test-expr; incr-expr) structured-block
特别地， test-expr 必须类似以下之一：
In particular, test-expr must look like one of the following:
var relational-op b
b relational-op var
其中 relational-op 是<，< =，>， = 和 b 是与var类型兼容的类型的循环不变性表达式。
where relational-op is one of <,<=,>,>= and b is a loop invariant expressions of a type compatible with the type of var.
除此之外，您必须确保：
Other than that you must ensure that:
所以，回到你的情况，我会检查 sqrtt 是一个循环不变的，并且所有线程都有相同的值。
So, coming back to your case, I would check sqrtt to be a loop invariant and to have the same value for all threads.
long long 在C ++ 11之前的C ++中不是标准的， =http://stackoverflow.com/a/2836891/771663> SO上的此问题。
long long isn't standard in C++ prior to C++11, see for instance this question on SO.
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