Compile the code with:
gcc -w int.c -o int.exe and run it by
./int.exe Output: (unit in bytes, multiply by 8 to convert into bits)
sizeof(short) = 2 sizeof(int) = 4 sizeof(long) = 8 sizeof(long long) = 8 sizeof(size_t) = 8 sizeof(off_t) = 8 sizeof(void *) = 8The output above is consistent with the definitions in
Table source: https://en.wikipedia.org/wiki/64-bit_computing
ILP32: Integer Long Pointer 32-bit model
LLP64: Long Long Pointer 64-bit model
LP64: Long Pointer 64-bit model
ILP64: Integer Long Pointer 64-bit model
SILP64: Short Integer Long Pointer 64-bit model
To check the limits in integer and floating-point numbers in 64-bit system, we can use the following sample C code:
Compile the code with:
gcc limit.c -o limit.exe and run it by
./limit.exe Output:
char_min = -128, char_max = 127 short_min = 2048, short_max = 2047 int_min = -2147483648, int_max = 2147483647 long_long_min = -9223372036854775808, long_long_max = 9223372036854775807 unsigned_char_min = 0, unsigned_char_max = 255 unsigned_short_min = 0, unsigned_short_max = 65535 unsigned_int_min = 0, unsigned_int_max = 4294967295 long_min = 0, long_max = 4294967295 unsigned_long_long_min = 0, unsigned_long_long_max = 18446744073709551615 float_min = -340282306073709652508363335590014353408.000000, float_max = 340282306073709652508363335590014353408.000000 double_min = -179769300000000004979913091153546431177385676945343486730197993498529636492108312404543796370045487218955201046137662191918513706549560771088224207924409275479864981823815660983343422176365744870072127934490865277449576937261468130920376085948653305075071243237207672347403131791038321491100101082182265602048.000000, double_max = 179769300000000004979913091153546431177385676945343486730197993498529636492108312404543796370045487218955201046137662191918513706549560771088224207924409275479864981823815660983343422176365744870072127934490865277449576937261468130920376085948653305075071243237207672347403131791038321491100101082182265602048.000000