signed int i;           // 'signed' is default
 
signed char            -128 to 127
signed int             -32768 to 32767 (signed is default)
                       [or -2147483648 to 2147483647 if '-mnoshort' is given]
signed short int       -32768 to 32767
signed long int        -2147483648 to 2147483647