CODEWITHSUNDEEP
cuda
Harshit
Harshit

Reputation: 1

Format specifier for cuDoubleComplex variables for accessing files

In C , we can easily access file using fprintf() and fscanf() as shown below:

fp = fopen(“forces1.txt”, “w”);
for(h=0;h<147;h++)
{
fprintf(fp, “%f %f %f\n”, ForceX[h], ForceY[h], ForceZ[h]);
}

But I am using CUDA and my variables ForceX[h] etc are of type cuDoubleComplex. I want to ask two things:

  1. Whether I am allowed to use frintf and fscanf in CUDA, if not then how to access files.
  2. What will be the format specifier used in place of %f as my variable is not float.

Upvotes: 0

Views: 138

Answers (1)

Robert Crovella
Robert Crovella

Reputation: 152003

From here:

in cuComplex.h (which is in the CUDA include directory in your CUDA install) we can see the following typedef:

typedef double2 cuDoubleComplex;

and double2 is a struct definition (in vector_types.h, same directory) that looks like this:

struct double2 {

  double x,y;
};

So now your question is a C or C++ question. You can print the elements (.x, .y) of that struct easily enough using the %f format specifier.

Yes, you can use fprintf and fscanf in CUDA host code, just like you would in ordinary host code.

Upvotes: 1

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