Invalid suffix "-252" on integer constant

I've been trying to run a C file from https://github.com/amree/mykad-c/blob/master/scdump.c, but I keep getting Invalid suffix "-252" on integer constant at this part of the code:

        if (RxBuffer[0x11E-252] == 'P')
            printf("Female\n");
        else if (RxBuffer[0x11E-252] == 'L')
            printf("Male\n");
        else
            printf("%c\n", RxBuffer[0x11E-252]);

I'm pretty sure it's syntax related. But I don't really understand code (I'm trying to, but I'm pretty much stuck). Can anyone help me?