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  1. #include <stdarg.h>
  2. #include <stdio.h>
  3.  
  4. /*** Macros */
  5.  
  6. #define CountOf(array) (sizeof (array) / sizeof *(array))
  7. #define ArgCount(...) (CountOf(((int[]){__VA_ARGS__})))
  8.  
  9. /*** Function declarations */
  10.  
  11. void test(int arg_count, ...);
  12. #define test(...) test(ArgCount(__VA_ARGS__), __VA_ARGS__)
  13.  
  14. /*** Function definitions */
  15.  
  16. int main(void) {
  17.     int i, j, k;
  18.  
  19.     i = j = k = 42;
  20.     test(i, ++j, k++);
  21.     return 0;
  22.   }
  23.  
  24. #undef test
  25. void test(int arg_count, ...) {
  26.     va_list vargs;
  27.     int arg;
  28.  
  29.     if (!arg_count) {
  30.         printf("No arguments passed!\n");
  31.       }
  32.  
  33.     printf("{ ");
  34.     va_start(vargs, arg_count);
  35.     while (arg_count--) {
  36.         arg = va_arg(vargs, int);
  37.         printf("%d, ", arg);
  38.         continue;
  39.       }
  40.     va_end(vargs);
  41.     printf("}\n");
  42.  
  43.     return;
  44.   }
Success #stdin #stdout 0.01s 1720KB
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stdin
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Standard input is empty
stdout
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{ 42, 43, 42, }
https://ideone.com/HhSto
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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