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  1. #include <math.h>
  2. #include <stdio.h>
  3.  
  4. int NaturalCheck(double num)
  5. {
  6. 	double integral = 0.0f;
  7. 	double fractional = 0.0f;
  8.  
  9. 	printf("%lf\n", num);
  10.  
  11. 	fractional = modf(num, &integral);
  12.  
  13. 	if ((num >= 0) && (fractional == 0.0))
  14. 	{
  15. 		return 1;
  16. 	}
  17. 	else
  18. 	{
  19. 		return -1;
  20. 	}
  21. }
  22.  
  23. int main()
  24. {
  25. 	double num;
  26.  
  27. 	scanf("%lf", &num);
  28.  
  29. 	printf("%d\n", NaturalCheck(num));
  30.  
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 2056KB
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stdin
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10.0
stdout
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10.000000
1
https://ideone.com/6SHIVB
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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