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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct base
  5. {
  6. 	double some;
  7. 	char space_for_subclasses[];
  8. };
  9.  
  10. struct derived
  11. {
  12. 	double some;
  13. 	int value;
  14. };
  15.  
  16. int main(void) {
  17. 	struct base *b = malloc(sizeof(struct derived));
  18. 	b->some = 123.456;
  19. 	struct derived *d = (struct derived*)(b);
  20. 	d->value = 4;
  21. 	struct base *bb = (struct base*)(d);
  22. 	printf("%f\t%f\t%d\n", d->some, bb->some, d->value);
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 9416KB
comments (?)
stdin
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Standard input is empty
stdout
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123.456000	123.456000	4
https://ideone.com/L0MtvZ
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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