printf 16进制 64bit

实验：

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1. #include <stdio.h>
   
2. #include <stdint.h>
   
3. 
   
4. int main ( void )
   
5. {
   
6.     uint64_t udata = 0x123456789ULL;
   
7. 
   
8.     printf("0x%llx\n", udata);
   
9.     printf("%#llx\n", udata);
   
10. 
    
11.     printf("%#08llx\n", udata);
    
12.     printf("%#016llx\n", udata);
    
13. 
    
14.     printf("0x%016llx\n", udata);
    
15.     printf("%#018llx\n", udata);
    
16. }

输出：

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1. 0x123456789
   
2. 0x123456789
   
3. 0x123456789
   
4. 0x00000123456789
   
5. 0x0000000123456789
   
6. 0x0000000123456789