Question

Why does the following snippet not work with CUDA (both 3.2 and 4.0)?

#define NUM_BLOCKS 16

// lots of code.

dim3 dimBlock(NUM_BLOCKS, NUM_BLOCKS);

but this,

dim3 dimBlock(16, 16);

does?

I keep getting a error : expected a ")" and error : expected an expression. What am I missing?

Answer 1

Are you certain you didn’t write

#define NUM_BLOCKS 16;

(note the semicolon at the end)?

I get exactly the errors you described, when the erroneus semicolon is there.