Question

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Set all bytes of int to (unsigned char)0, guaranteed to represent zero?

I have the following anonymous union inside a struct:

union
{
    unsigned value;
    char name[4];
};

Can I replace the following code:

name[0] = 0;
name[1] = 0;
name[2] = 0;
name[3] = 0;

With the following code?

value = 0;

Answer 1

In your simple case it’s the same, but only because (most likely) int (and unsigned is short for unsigned int) is 32 bits (i.e. four bytes). If the array is larger, or int is only 16 bits it will not be the same.