#include<stdio.h>
void main()
{
  //使用sizeof驗證數(shù)據(jù)類型在內(nèi)存中占用的空間大小
//  char
//  int
//  short
//  long
//  unsigned int
//  float
//  double
//  long double
  printf("在64位機器中：\n");
  printf("    char類型占%d個字節(jié)\n",sizeof(char));
  printf("    short類型占%d個字節(jié)\n",sizeof(short));
  printf("     int類型占%d個字節(jié)\n",sizeof(int));
  printf("    long類型占%d個字節(jié)\n",sizeof(long));
  printf("unsigned int類型占%d個字節(jié)\n",sizeof(unsigned int));
  printf("    float類型占%d個字節(jié)\n",sizeof(float));
  printf("   double類型占%d個字節(jié)\n",sizeof(double));
  printf(" long double類型占%d個字節(jié)\n",sizeof(long double));
  printf("-------------------指針占4個字節(jié)---------------------\n");
  char *p0;
  short *p1;
  int *p2;
  long *p3;
  unsigned int *p4;
  float *p5;
  double *p6;
  long double *p7;
  printf("    char類型指針占%d個字節(jié)\n",sizeof(p0));
  printf("    short類型指針占%d個字節(jié)\n",sizeof(p1));
  printf("     int類型指針占%d個字節(jié)\n",sizeof(p2));
  printf("    long類型指針占%d個字節(jié)\n",sizeof(p3));
  printf("unsigned int類型指針占%d個字節(jié)\n",sizeof(p4));
  printf("    float類型指針占%d個字節(jié)\n",sizeof(p5));
  printf("   double類型指針占%d個字節(jié)\n",sizeof(p6));
  printf(" long double類型指針占%d個字節(jié)\n",sizeof(p7));
}

在64位機器中：
    char類型占1個字節(jié)
    short類型占2個字節(jié)
     int類型占4個字節(jié)
    long類型占4個字節(jié)
unsigned int類型占4個字節(jié)
    float類型占4個字節(jié)
   double類型占8個字節(jié)
 long double類型占12個字節(jié)
-------------------指針占4個字節(jié)---------------------
    char類型指針占4個字節(jié)
    short類型指針占4個字節(jié)
     int類型指針占4個字節(jié)
    long類型指針占4個字節(jié)
unsigned int類型指針占4個字節(jié)
    float類型指針占4個字節(jié)
   double類型指針占4個字節(jié)
 long double類型指針占4個字節(jié)

//十進制轉(zhuǎn)ASCII碼
//年#define KB2ASC(x) (u8)(0x30+x)
//ASCII碼轉(zhuǎn)十進制
//年
#define ASC2KB(x) (u8)(x%(0x30))