Difference between revisions of "C datatypes"
From Teknologisk videncenter
m (→Int and long int) |
m (→Compiling and running) |
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| Line 29: | Line 29: | ||
</source> | </source> | ||
==Compiling and running== | ==Compiling and running== | ||
| + | ===On a 64 bit system=== | ||
<source lang=bash> | <source lang=bash> | ||
heth@mars:~/bin$ gcc -v | heth@mars:~/bin$ gcc -v | ||
| Line 52: | Line 53: | ||
heth@mars:~/bin$ | heth@mars:~/bin$ | ||
</source> | </source> | ||
| + | ===On a 32 bit system=== | ||
| + | <source lang=bash> | ||
| + | heth@mars:~/bin$ gcc types.c -o types | ||
| + | heth@mars:~/bin$ ./types | ||
| + | Wordsize is 32 | ||
| + | The number of bits in a byte 8 | ||
| + | The minimum value of SIGNED CHAR = -128 | ||
| + | The maximum value of SIGNED CHAR = 127 | ||
| + | The maximum value of UNSIGNED CHAR = 255 | ||
| + | The minimum value of SHORT INT = -32768 | ||
| + | The maximum value of SHORT INT = 32767 | ||
| + | The minimum value of INT = -2147483648 | ||
| + | The maximum value of INT = 2147483647 | ||
| + | The minimum value of CHAR = 0 | ||
| + | The maximum value of CHAR = 255 | ||
| + | The minimum value of LONG = -2147483648 | ||
| + | The maximum value of LONG = 2147483647 | ||
| + | The minimum value of LONG = -2147483648 | ||
| + | The maximum value of UNSIGNED LONG = 2147483647 | ||
| + | </source> | ||
[[Category:C]] | [[Category:C]] | ||
Revision as of 10:17, 27 November 2022
Contents
Int and long int
See the file limits.h for details - Properly at /usr/include/limits.h
#include <stdio.h>
#include <limits.h>
int main() {
printf("Wordsize is %d\n\n", __WORDSIZE);
printf("The number of bits in a byte %d\n", CHAR_BIT);
printf("The minimum value of SIGNED CHAR = %d\n", SCHAR_MIN);
printf("The maximum value of SIGNED CHAR = %d\n", SCHAR_MAX);
printf("The maximum value of UNSIGNED CHAR = %d\n", UCHAR_MAX);
printf("The minimum value of SHORT INT = %d\n", SHRT_MIN);
printf("The maximum value of SHORT INT = %d\n", SHRT_MAX);
printf("The minimum value of INT = %d\n", INT_MIN);
printf("The maximum value of INT = %d\n", INT_MAX);
printf("The minimum value of CHAR = %d\n", CHAR_MIN);
printf("The maximum value of CHAR = %d\n", CHAR_MAX);
printf("The minimum value of LONG = %ld\n", LONG_MIN);
printf("The maximum value of LONG = %ld\n", LONG_MAX);
return(0);
}
Compiling and running
On a 64 bit system
heth@mars:~/bin$ gcc -v
gcc version 4.4.5 (Ubuntu/Linaro 4.4.5-15ubuntu1)
heth@mars:~/bin$ uname -a
Linux mars 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 02:41:37 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
heth@mars:~/bin$ gcc types.c -o types
heth@mars:~/bin$ ./types
Wordsize us 64
The number of bits in a byte 8
The minimum value of SIGNED CHAR = -128
The maximum value of SIGNED CHAR = 127
The maximum value of UNSIGNED CHAR = 255
The minimum value of SHORT INT = -32768
The maximum value of SHORT INT = 32767
The minimum value of INT = -2147483648
The maximum value of INT = 2147483647
The minimum value of CHAR = -128
The maximum value of CHAR = 127
The minimum value of LONG = -9223372036854775808
The maximum value of LONG = 9223372036854775807
heth@mars:~/bin$
On a 32 bit system
heth@mars:~/bin$ gcc types.c -o types
heth@mars:~/bin$ ./types
Wordsize is 32
The number of bits in a byte 8
The minimum value of SIGNED CHAR = -128
The maximum value of SIGNED CHAR = 127
The maximum value of UNSIGNED CHAR = 255
The minimum value of SHORT INT = -32768
The maximum value of SHORT INT = 32767
The minimum value of INT = -2147483648
The maximum value of INT = 2147483647
The minimum value of CHAR = 0
The maximum value of CHAR = 255
The minimum value of LONG = -2147483648
The maximum value of LONG = 2147483647
The minimum value of LONG = -2147483648
The maximum value of UNSIGNED LONG = 2147483647