I want to use the quadruple (128 bits) precision floating number data type in my C language programme by Intel C++ compiler 16.0 with the Visual Studio 2015 on the Windows 7 system. The intel c++ compiler has already been integrated to the Visual Studio and I have already switched to "use the Intel Compiler".
But I just can't identity the quadruple data type variables, i.e. when I code like " _Quad a; ", the compiler just would not pass, with the error reads " error : identifier "_Quad" is undefined".
So should I set any options for the compiler to enable the use of quadruple precision data type ?
I have already set the "Floating Point Model" to "Precise"; and set "Floating Point Expression Evaluation" to "Extended".
Or should I include any thing in the header?
I attached my very simple C language code, can anyone help me with this problem?
THANK YOU VERY MUCH !!!