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[Reply #30 on:]

I don't have an arduino at hand, so I tested this on linux:

Code:

#define ARY_LEN(a) (sizeof(a)/sizeof(a[0]))

#define CMD_MAX_LEN 50

char cmdArray1[][CMD_MAX_LEN] = {
    "COM1",
    "COM2",
};

char cmdArray2[][CMD_MAX_LEN] = {
    "COM1",
    "COM2"
};

void main(int argc, char** argv) {
    printf("ary len 1 = %d\n", ARY_LEN(cmdArray1));
    printf("ary len 2 = %d\n", ARY_LEN(cmdArray2));

    printf("sizeof(ary1) = %d\n", sizeof(cmdArray1));
    printf("sizeof(ary2) = %d\n", sizeof(cmdArray2));
}

Result:

Code:

ary len 1 = 2
ary len 2 = 2
sizeof(ary1) = 100
sizeof(ary2) = 100

[Reply #31 on:]

Using ARY_LEN(commands) is IMHO more convenient than having to update a constant every time you add or remove a string from the array.

I agree!