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  1. #include <stdio.h>
  2.  
  3. void foo( unsigned char a, 
  4. 	  unsigned char b, 
  5. 	  unsigned char c, 
  6. 	  ...  )
  7. {
  8.         printf( "a: %p\nb: %p\nc: %p\n", 
  9.                 (void *)&a, 
  10.                 (void *)&b, 
  11.                 (void *)&c );
  12.  
  13.         printf( "c-11: %hhu\n", *(&c - 11) );
  14.         printf( "c-10: %hhu\n", *(&c - 10) );
  15.         printf( "c-09: %hhu\n", *(&c -  9) );
  16.         printf( "c-08: %hhu\n", *(&c -  8) );
  17.         printf( "c-07: %hhu\n", *(&c -  7) );
  18.         printf( "c-06: %hhu\n", *(&c -  6) );
  19.         printf( "c-05: %hhu\n", *(&c -  5) );
  20.         printf( "c-04: %hhu\n", *(&c -  4) );
  21.         printf( "c-03: %hhu\n", *(&c -  3) );
  22.         printf( "c-02: %hhu\n", *(&c -  2) );
  23.         printf( "c-01: %hhu\n", *(&c -  1) );
  24.         printf( "c+00: %hhu\n", *(&c -  0) );
  25.         printf( "c+01: %hhu\n", *(&c +  1) );
  26.         printf( "c+02: %hhu\n", *(&c +  2) );
  27.         printf( "c+03: %hhu\n", *(&c +  3) );
  28.         printf( "c+04: %hhu\n", *(&c +  4) );
  29.         printf( "c+05: %hhu\n", *(&c +  5) );
  30.         printf( "c+06: %hhu\n", *(&c +  6) );
  31.         printf( "c+07: %hhu\n", *(&c +  7) );
  32.         printf( "c+08: %hhu\n", *(&c +  8) );
  33.         printf( "c+09: %hhu\n", *(&c +  9) );
  34.         printf( "c+10: %hhu\n", *(&c + 10) );
  35.         printf( "c+11: %hhu\n", *(&c + 11) );
  36.  
  37. }
  38.  
  39.  
  40.  
  41. int main(void)
  42. {
  43.         foo( 1, 2, 3, 4 );
  44.  
  45.  
  46.         return 0;
  47. }
  48.  
Success #stdin #stdout 0.01s 1720KB
comments (?)
stdin
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Standard input is empty
stdout
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a: 0xbf805dc8
b: 0xbf805dc4
c: 0xbf805dc0
c-11: 93
c-10: 0
c-09: 0
c-08: 196
c-07: 93
c-06: 128
c-05: 191
c-04: 192
c-03: 93
c-02: 128
c-01: 191
c+00: 3
c+01: 207
c+02: 126
c+03: 183
c+04: 2
c+05: 159
c+06: 4
c+07: 8
c+08: 1
c+09: 93
c+10: 128
c+11: 191
https://ideone.com/s5v5d
language:
C99 (gcc 8.3)
created:
14 years ago
visibility:
public

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