系统使用哪种类型的大小？

#include <stdio.h>

int main(voID)
{

    printf("Type int has a size of %zd bytes.\n", sizeof(int));
    printf("Type char has a size of %zd bytes.\n", sizeof(char));
    printf("Type long has a size of %zd bytes.\n", sizeof(long));
    printf("Type long long has a size of %zd bytes.\n",sizeof(long long));
    printf("Type double has a size of %zd bytes.\n",sizeof(double));
    printf("Type long double has a size of %zd bytes.\n",sizeof(long double));
    return 0;//from w w w.  java2 s. c  o m
}