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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main(void) {
  5. 	double d1 = 1. * 0.;
  6. 	double d2 = (-1.) * 0;
  7.  
  8. 	printf("d1: %f\n", d1);
  9. 	printf("d2: %f\n", d2);
  10.  
  11. 	printf("d1 == d2: %s\n", (d1 == d2)?"true":"false");
  12.  
  13. 	printf("signbit(d1) != 0: %d\n", (int)(signbit(d1) != 0));
  14. 	printf("signbit(d2) != 0: %d\n", (int)(signbit(d2) != 0));
  15.  
  16. 	printf("copysign(1., d1): %f\n", copysign(1., d1));
  17. 	printf("copysign(1., d2): %f\n", copysign(1., d2));
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 4520KB
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stdin
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Standard input is empty
stdout
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d1: 0.000000
d2: -0.000000
d1 == d2: true
signbit(d1) != 0: 0
signbit(d2) != 0: 1
copysign(1., d1): 1.000000
copysign(1., d2): -1.000000
https://ideone.com/Rmo5LQ
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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