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  1. #include <stdio.h>
  2.  
  3. int ic, cd, dc, ci;
  4.  
  5. void prepare(int n, char chd, double d, char chi, int i)
  6. {
  7.   printf("%p\n%p\n%p\n%p\n%p\n", &n, &chd, &d, &chi, &i);
  8.  
  9.   ic = (char*)&chd - (char*)&n;
  10.   cd = (char*)&d - (char*)&chd;
  11.   dc = (char*)&chi - (char*)&d;
  12.   ci = (char*)&i - (char*)&chi;
  13. }
  14.  
  15. double sum(int n, ...)
  16. {
  17.   printf("%d\n", n);
  18.  
  19.   if (!ic)
  20.   {
  21.   	prepare(0, '0', 0., '0', 0);
  22.   	printf("%d %d %d %d\n", ic, cd, dc, ci);
  23.   	fflush(stdout);
  24.   }
  25.  
  26.   char *p = (char*)&n + ic;
  27.   double sum = 0;
  28.  
  29.   while (n--)
  30.     switch (*p)
  31.     {
  32.       case 'i':
  33.         // printf("%d\n", *(int*)(p += ci));
  34.         sum += *(int*)(p += ci);
  35.         p += ic;
  36.         break;
  37.  
  38.       case 'd':
  39.         sum += *(double*)(p += cd);
  40.         p += dc;
  41.         break;
  42.  
  43.       default:
  44.         fputs(stderr, "Invalid type");
  45.     	return sum;
  46.     }
  47.  
  48.   return sum;
  49. }
  50.  
  51. int main(void)
  52. {
  53.   double x = sum(6, 'i', 1, 'd', 2., 'i', 3, 'd', 4., 'i', 5, 'd', 6.);
  54.   printf("%f\n", x);
  55.   return 0;
  56. }
Runtime error #stdin #stdout 0s 4384KB
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stdin
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Standard input is empty
stdout
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6
0x7ffeebd3cf88
0x7ffeebd3cf86
0x7ffeebd3cf90
0x7ffeebd3cf87
0x7ffeebd3cf8c
-2 10 -9 5
https://ideone.com/1gdHCz
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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