C datatypes
From Teknologisk videncenter
Int and long int
#include <stdio.h>
//Author: heth@mercantec.dk
int main( void ) {
int int_max,int_min;
unsigned int uint_max;
long int lint_max,lint_min;
unsigned long int ulint_max;
printf("Integer size = %i - long integer size = %i\n",
(int) sizeof(int_max), (int) sizeof(lint_max) );
printf("================= integer ================\n");
int_max = 0x7fffffff;
int_min = 0x80000000;
printf("int_max = %i og int_min = %i\n", int_max,int_min);
int_max++;
int_min--;
printf("int_max = %i og int_min = %i\n", int_max,int_min);
printf("=========== Unsigned integer =============\n");
uint_max = 0xffffffff;
printf("uint_max = %u\n" , uint_max);
uint_max++;
printf("uint_max = %u\n", uint_max);
printf("==============Long integer ===============\n");
lint_max = 0x7fffffffffffffff;
lint_min = 0x8000000000000000;
printf("lint_max = %li og lint_min = %li\n", lint_max,lint_min);
lint_max++;
lint_min--;
printf("lint_max = %li og lint_min = %li\n", lint_max,lint_min);
printf("=========== Unsigned long integer =============\n");
ulint_max = 0xffffffffffffffff;
printf("ulint_max = %lu\n" , ulint_max);
ulint_max++;
printf("ulint_max = %lu\n", ulint_max);
}
Compiling and running
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
Integer size = 4 - long integer size = 8
================= integer ================
int_max = 2147483647 og int_min = -2147483648
int_max = -2147483648 og int_min = 2147483647
=========== Unsigned integer =============
uint_max = 4294967295
uint_max = 0
==============Long integer ===============
lint_max = 9223372036854775807 og lint_min = -9223372036854775808
lint_max = -9223372036854775808 og lint_min = 9223372036854775807
=========== Unsigned long integer =============
ulint_max = 18446744073709551615
ulint_max = 0
heth@mars:~/bin$