This is a slightly modified bit of code from pp13-14 of
Core Mac OS X And Unix Programming from Dalrymple and Hillegass, to display min/max limits of various built-in C primitives. I added some extra things to examine and then compiled for the 32 and 64-bit cases below.
( c )
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
int main( int argc, char *argv[] ) {
printf( " type: bytes %20s %20s %20s\n", "min value", "max value", "max unsigned" );
printf( " char: %5ld %20d %20d %20u\n", sizeof(char), CHAR_MIN, CHAR_MAX, UCHAR_MAX );
printf( " short: %5ld %20d %20d %20u\n", sizeof(short), SHRT_MIN, SHRT_MAX, USHRT_MAX );
printf( " int: %5ld %20d %20d %20u\n", sizeof(int), INT_MIN, INT_MAX, UINT_MAX );
printf( " long: %5ld %20ld %20ld %20lu\n", sizeof(long), LONG_MIN, LONG_MAX, ULONG_MAX );
#ifdef LLONG_MIN
printf( " long long: %5ld %20lld %20lld %20llu\n", sizeof(long long),
LLONG_MIN, LLONG_MAX, (long long)ULLONG_MAX );
#endif
printf( " float: %5ld\n", sizeof(float));
printf( " void *: %5ld\n", sizeof(void *));
printf( " double: %5ld\n", sizeof(double));
printf( "long double: %5ld\n", sizeof(long double));
printf( " long bit: %5d\n", LONG_BIT);
printf( " word bit: %5d\n", WORD_BIT);
printf( " size_t: %5ld\n", sizeof(SIZE_T_MAX));
printf( " ssize_t: %5ld\n", sizeof(SSIZE_MAX));
return EXIT_SUCCESS;
}
1 #include <limits.h> 2 #include <stdio.h> 3 #include <stdlib.h> 4 5 int main ( int argc, char *argv[] ) { 6 printf ( " type: bytes %20s %20s %20s\n" , "min value" , "max value" , "max unsigned" ); 7 printf ( " char: %5ld %20d %20d %20u\n" , sizeof (char ), CHAR_MIN, CHAR_MAX, UCHAR_MAX ); 8 printf ( " short: %5ld %20d %20d %20u\n" , sizeof (short ), SHRT_MIN, SHRT_MAX, USHRT_MAX ); 9 printf ( " int: %5ld %20d %20d %20u\n" , sizeof (int ), INT_MIN, INT_MAX, UINT_MAX ); 10 printf ( " long: %5ld %20ld %20ld %20lu\n" , sizeof (long ), LONG_MIN, LONG_MAX, ULONG_MAX ); 11 #ifdef LLONG_MIN 12 printf ( " long long: %5ld %20lld %20lld %20llu\n" , sizeof (long long), 13 LLONG_MIN, LLONG_MAX, (long long)ULLONG_MAX ); 14 #endif 15 printf ( " float: %5ld\n" , sizeof (float )); 16 printf ( " void *: %5ld\n" , sizeof (void *)); 17 printf ( " double: %5ld\n" , sizeof (double )); 18 printf ( "long double: %5ld\n" , sizeof (long double)); 19 printf ( " long bit: %5d\n" , LONG_BIT); 20 printf ( " word bit: %5d\n" , WORD_BIT); 21 printf ( " size_t: %5ld\n" , sizeof (SIZE_T_MAX)); 22 printf ( " ssize_t: %5ld\n" , sizeof (SSIZE_MAX)); 23 return EXIT_SUCCESS; 24 }Output produced from my x86-based Mac in normal 32-bit mode:
1 [~/Programming/C]% gcc -arch i386 -o limits limits.c 2 [~/Programming/C]% ./limits 3 type: bytes min value max value max unsigned 4 char: 1 -128 127 255 5 short: 2 -32768 32767 65535 6 int: 4 -2147483648 2147483647 4294967295 7 long: 4 -2147483648 2147483647 4294967295 8 long long: 8 -9223372036854775808 9223372036854775807 18446744073709551615 9 float: 4 10 void *: 4 11 double: 8 12 long double: 16 13 long bit: 32 14 word bit: 32 15 size_t: 4 16 ssize_t: 4 and for the 64-bit case:
1 [~/Programming/C]% gcc -arch x86_64 -o limits64 limits.c 2 [~/Programming/C]% ./limits64 3 type: bytes min value max value max unsigned 4 char: 1 -128 127 255 5 short: 2 -32768 32767 65535 6 int: 4 -2147483648 2147483647 4294967295 7 long: 8 -9223372036854775808 9223372036854775807 18446744073709551615 8 long long: 8 -9223372036854775808 9223372036854775807 18446744073709551615 9 float: 4 10 void *: 8 11 double: 8 12 long double: 16 13 long bit: 64 14 word bit: 32 15 size_t: 8 16 ssize_t: 8