Question

I need to switch based on a 4-character string. I put the string in a union so I can at least refer to it as a 32-bit integer.

union
{
    int32u  integer;
    char    string[4];
}software_version;

But now I don’t know what to write in the case statements. I need some kind of macro to convert a 4-character string literal into the integer. E.G.

#define STRING_TO_INTEGER(s)    ?? What goes here ??
#define VERSION_2_3_7           STRING_TO_INTEGER("0237")
#define VERSION_2_4_1           STRING_TO_INTEGER("0241")

switch (array[i].software_version.integer)
{
    case VERSION_2_3_7:
        break;

    case VERSION_2_4_1:
        break;
}

Is there a way to make the STRING_TO_INTEGER() macro. Or is there a better way to handle the switch?

Answer 1

Updated:

#define VERSION_2_3_7 '0237'