Arguments to C program question [duplicate]

Question

Possible Duplicate:
Should I use char** argv or char* argv[] in C?

What is the difference between using char **argv and char *argv[] for the second parameter to a c program. Does it affect the way the strings are passed? Thanks :-)

Answer 1

There is absolutely no difference. At all.

in C

void f(int*);

and

void f(int[]);

and

void f(int[42]);

are three completely identical declarations.

Answer 2

**argv and *argv[] as a function argument are technically identical - as C will convert any array into a pointer in a function argument.

Note that this can catch you out, for example this is totally valid and won't raise any warnings (or errors), even though a beginner might think that the array passed is invalid:

void func(int array[2])
{
    array[1] = 1; // buffer overrun: will write past the end of a[].
}

int main()
{
    int a[1];
    func(a);
    return 0;
}