代码的规划与规范化

转载

mob604756f828bf 2017-05-30 06:08:00

文章标签 #include c语言 2d 数据类型 .net 文章分类 代码人生

代码的规划和规范

　　早上在写代码时，为了测试不同数据类型的大小和指针的大小：　　

1 #include <stdio.h>
 2 
 3 typedef struct info{
 4     char a;
 5     char b;
 6     char g;
 7     char e;
 8     int d;                                                                                                                                           
 9     int f;
10    int c;
11 }Info;
12 
13 int main(int argc, char **argv)
14 {
15     int iVar = 20;
16     long lVar = 26565;
17     char ch = 'a';
18     double dVar = 3.1415926535897932;
19     Info sInfo;
20 
21     int *ptriVar = &iVar;
22     long *ptrlVar = &lVar;
23     char *ptrch = &ch;
24     double *ptrdVar = &dVar;
25     Info *ptrsInfo = &sInfo;
26 
27     printf("The size iVar %d, lVar %d, ch %d, dVar %d, sInfo %d\n", sizeof(iVar), sizeof(lVar), sizeof(ch), sizeof(dVar), sizeof(sInfo));
28     printf("The size ptriVar %d, ptrlVar %d, ptrch %d, ptrdVar %d, ptrsInfo %d\n", sizeof(ptriVar), sizeof(ptrlVar), sizeof(ptrch), sizeof(ptrdVar),    sizeof(ptrsInfo));
29     printf("The address ptriVar %p, ptrlVar %p, ptrch %p, ptrdVar %p, ptrsInfo %p\n", &ptriVar, &ptrlVar, &ptrch, &ptrdVar, &ptrsInfo);
30     printf("The value ptriVar %p, ptrlVar %p, ptrch %p, ptrdVar %p, ptrsInfo %p\n", ptriVar, ptrlVar, ptrch, ptrdVar, ptrsInfo);
31 
32     return 0;
33 }

　　结果如下：

　　The size iVar 4, lVar 8, ch 1, dVar 8, sInfo 16

　　The size ptriVar 8, ptrlVar 8, ptrch 8, ptrdVar 8, ptrsInfo 8

　　The address ptriVar 0x7ffdca27f2f8, ptrlVar 0x7ffdca27f2f0, ptrch 0x7ffdca27f2e8, ptrdVar 0x7ffdca27f2e0, ptrsInfo 0x7ffdca27f2d8

　　The value ptriVar 0x7ffdca27f32c, ptrlVar 0x7ffdca27f320, ptrch 0x7ffdca27f31f, ptrdVar 0x7ffdca27f310, ptrsInfo 0x7ffdca27f300

　　若代码修改如下：

1 #include <stdio.h>
 2 
 3 typedef struct info{
 4     char a;
 5     int c;
 6     char b;
 7     int d;
 8     char e;
 9     int f;
10    char g;                                                                                                                                          
11 }Info;
12 
13 int main(int argc, char **argv)
14 {   
15     int iVar = 20;
16     long lVar = 26565;
17     char ch = 'a';
18     double dVar = 3.1415926535897932;
19     Info sInfo;
20     
21     int *ptriVar = &iVar;
22     long *ptrlVar = &lVar;
23     char *ptrch = &ch;
24     double *ptrdVar = &dVar;
25     Info *ptrsInfo = &sInfo;
26     
27     printf("The size iVar %d, lVar %d, ch %d, dVar %d, sInfo %d\n", sizeof(iVar), sizeof(lVar), sizeof(ch), sizeof(dVar), sizeof(sInfo));
28     printf("The size ptriVar %d, ptrlVar %d, ptrch %d, ptrdVar %d, ptrsInfo %d\n", sizeof(ptriVar), sizeof(ptrlVar), sizeof(ptrch), sizeof(ptrdVar),    sizeof(ptrsInfo));
29     printf("The address ptriVar %p, ptrlVar %p, ptrch %p, ptrdVar %p, ptrsInfo %p\n", &ptriVar, &ptrlVar, &ptrch, &ptrdVar, &ptrsInfo);
30     printf("The value ptriVar %p, ptrlVar %p, ptrch %p, ptrdVar %p, ptrsInfo %p\n", ptriVar, ptrlVar, ptrch, ptrdVar, ptrsInfo);
31     
32     return 0;
33 }