以字节为单位测试C变量类型的大小

#include <stdio.h>

int main(void){
   printf( \nA char      is %d bytes, sizeof( char ));
   printf( \nAn int      is %d bytes, sizeof( int ));
   printf( \nA short     is %d bytes, sizeof( short ));
   printf( \nA long      is %d bytes, sizeof( long ));
   printf( \nA long long is %d bytes\n, sizeof( long long));
   printf( \nAn unsigned char  is %d bytes, sizeof( unsigned char ));
   printf( \nAn unsigned int   is %d bytes, sizeof( unsigned int ));
   printf( \nAn unsigned short is %d bytes, sizeof( unsigned short ));
   printf( \nAn unsigned long  is %d bytes, sizeof( unsigned long ));
   printf( \nAn unsigned long long is %d bytes\n,
                                 sizeof( unsigned long long));
   printf( \nA float     is %d bytes, sizeof( float ));
   printf( \nA double    is %d bytes, sizeof( double ));
   printf( \nA long double is %d bytes\n, sizeof( long double ));


   return 0;
}