对printf函数的理解1

看如下代码：

  #include <stdio.h>
  
  int main(int argc, const char *argv[])
  {
      printf("%s\n","peng","dopmg","石家庄铁道大学");                                                                          
      return 0;
  }

 

将代码改成：

 #include <stdio.h>
                                                                                                                              
 int main(int argc, const char *argv[])
 {
     printf("%s%s%s\n","peng","dopmg","石家庄铁道大学");
     return 0;
 }


结果变成：

 

格式化输出：

 1 #include <stdio.h>
 2 #include <limits.h>
 3 
 4 int main(void)
 5 {
 6 unsigned char uc = UCHAR_MAX;
 7 unsigned short us = USHRT_MAX;
 8 unsigned int ui = UINT_MAX;
 9 unsigned long ul = ULONG_MAX;
10 unsigned long long ull = ULLONG_MAX;
11 puts("[output, specific values are implementation-dependent.]");
12 
13 printf("UCHAR_MAX, %u (decimal), %#o (octal), %#x (hex)\n",
14 uc, uc, uc);
15 
16 
17 printf("USHRT_MAX, %u (decimal), %#o (octal), %#x (hex)\n",
18 us, us, us);
19 
20 printf("UINT_MAX, %u (decimal), %#o (octal),\n %#x (hex)\n",
21 ui, ui, ui);
22 
23 printf("ULONG_MAX, %lu (decimal), %#lo (octal),\n %#lx (hex)\n",
24 ul, ul, ul);
25 
26 printf
27 ("ULLONG_MAX, %llu (decimal),\n %#llo (octal),\n %#llx (hex)\n",
28 ull, ull, ull);
29 
30 puts("[end of output]");
31 return 0;
32 }
33 
34 [output, specific values are implementation-dependent.]
35 UCHAR_MAX, 255 (decimal), 0377 (octal), 0xff (hex)
36 USHRT_MAX, 65535 (decimal), 0177777 (octal), 0xffff (hex)
37 UINT_MAX, 4294967295 (decimal), 037777777777 (octal),
38 0xffffffff (hex)
39 ULONG_MAX, 4294967295 (decimal), 037777777777 (octal),
40 0xffffffff (hex)
41 ULLONG_MAX, 18446744073709551615 (decimal),
42 01777777777777777777777 (octal),
43 0xffffffffffffffff (hex)
44 [end of output]

 

posted @ 2013-09-09 16:25  摩斯电码  阅读(442)  评论(0)  编辑  收藏  举报