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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.  
  5. 	unsigned long long x1n = 0x7ff0000000000000ULL; // Inf
  6. 	double x1 = *((double*)&x1n);
  7. 	unsigned long long x2n = 0x7ff0000000000001ULL; // Signaling NaN
  8. 	double x2 = *((double*)&x2n);
  9.  
  10. 	printf("\nx1=%f, x2=%f sizeof(double) = %d", x1, x2, sizeof(x2));
  11. 	if (x1 == x2)
  12. 		printf("\nx1==x2");
  13. 	else
  14. 		printf("\nx1!=x2"); // x1 != x2
  15.  
  16. 	return 0;
  17. }
  18.  
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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x1=inf, x2=nan sizeof(double) = 8
x1!=x2
https://ideone.com/aFzIqx
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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