A question on variable defination

Hi, all,

a question on the following defination:
an external function is defined as:
nmriopen(char *const filename, const int np1, const float step1,
const int np2, const float step2)

what's the difference if it is defined as:
nmriopen(char filename, int np1, float step1,
int np2, float step2)

and what if use "int *const np1" instead of "const int np1"?

Thanks!

Jing

.

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