Learn point C language (15): Data type

The variable that gets the type size is best not the int type, but the size_t type;

size_t are defined in stdio.h and stddef.h.

1. Get the size of a known type:

#include <stdio.h>
#include <stddef.h>

int main (void)
{
char n = 2;
size_t size;

size = sizeof (char);
printf ("%*u:char\n", n,size);

size = sizeof (unsigned char);
printf ("%*u:unsigned char\n", n,size);

size = sizeof (short);
printf ("%*u:short\n", n,size);

size = sizeof (unsigned short);
printf ("%*u:unsigned short\n", n,size);

size = sizeof (int);
printf ("%*u:int\n", n,size);

size = sizeof (unsigned);
printf ("%*u:unsigned\n", n,size);

size = sizeof (long);
printf ("%*u:long\n", n,size);

size = sizeof (unsigned long);
printf ("%*u:unsigned long\n", n,size);

size = sizeof (long long);
printf ("%*u:long long\n", n,size);

size = sizeof (unsigned long long);
printf ("%*u:unsigned long long\n", n,size);

size = sizeof (float);
printf ("%*u:float\n", n,size);

size = sizeof (double);
printf ("%*u:double\n", n,size);

size = sizeof (long double);
printf ("%*u:long double\n", n,size);

size = sizeof (wchar_t);
printf ("%*u:wchar_t\n", n,size);

GetChar ();
return 0;
}