This is output from `defines' version 4.1.1, from your buddies at Newtware! Fri Jan 1 00:02:02 PST 1999 386BSD 0.0 #Jolix-0.0new i386 cc = [cc] strings; 2: No such file or directory __BASE_FILE__ = "/tmp/def10.c" __DATE__ = "Jan 1 1999" __FILE__ = "/tmp/def10.c" __GNUC__ = 1 __INCLUDE_LEVEL__ = 0 __LINE__ = 3260 __STDC__ = 1 __TIME__ = "00:02:05" __VERSION__ = "1.39" i386 = 1 i386b = 1 unix = 1 Checking other possibilities; should already be listed above: __DATE__ = "Jan 1 1999" __FILE__ = "/tmp/def10.c" __GNUC__ = 1 __LINE__ = 25 __STDC__ = 1 __TIME__ = "00:02:05" Sizes of basic variable types: sizeof(char) = 8 bits sizeof(short) = 16 bits sizeof(int) = 32 bits sizeof(long) = 32 bits sizeof(float) = 32 bits sizeof(double) = 64 bits sizeof(long double) = 64 bits sizeof(char *) = 32 bits sizeof(char (*)(char)) = 32 bits