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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int i = (1,2,3,4,5);
  5. 	int j = {1,2,3,4,5};
  6. 	int k = *(&i+1);
  7. 	printf("(1,2,3,4,5) = %d\tthrows away values 1-4\n",i);
  8. 	printf("{1,2,3,4,5} = %d\ttries to initialise an array starting where our int is stored (nasty UB)\n",j);
  9. 	printf("Does the compiler limit initialisation to only the int? %s",k!=2?"yes":"no");
  10. 	return 0;
  11. }
  12.  
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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(1,2,3,4,5) = 5	throws away values 1-4
{1,2,3,4,5} = 1	tries to initialise an array starting where our int is stored (nasty UB)
Does the compiler limit initialisation to only the int? yes
https://ideone.com/zpmYH7
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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