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  1. #include <math.h>
  2. #include <stdio.h>
  3.  
  4. void dispf(float f)
  5. {
  6. 	char		str[32];
  7. 	char*		pc;
  8. 	unsigned char*	pf;
  9. 	int		i, b;
  10.  
  11. 	pf = (unsigned char*)&f;
  12. 	pc = str;
  13. 	for (i = 0; i < 4; i++) {
  14. 		for (b = 0; b < 8; b++) {
  15. 			*pc++ = '0'+((pf[3-i]>>(7-b))&1);
  16. 		}
  17. 	}
  18. 	printf("%.1s %.8s %.23s\n", str, str + 1, str + 9);
  19. 	printf("%E\n", f);
  20. 	printf("%f\n", f);
  21. }
  22.  
  23. int main()
  24. {
  25. 	char	s[32];
  26. 	float	a, b, c;
  27.  
  28. 	printf("a = 1970.199707\n");
  29. 	a = (float)1970.199707;
  30. 	dispf(a);
  31. 	sprintf(s, "%E", a);
  32. 	printf("b = %s\n", s);
  33. 	sscanf(s, "%E", &b);
  34. 	dispf(b);
  35. 	printf("c = fabsf(a - b)\n");
  36. 	c = fabsf(a - b);
  37. 	dispf(c);
  38. 	printf("%s\n", (c<=0.001)?"true":"false");
  39. 	return 0;
  40. }
  41.  
Success #stdin #stdout 0.01s 1676KB
comments (?)
stdin 
Standard input is empty
stdout 
a = 1970.199707
0 10001001 11101100100011001100100
1.970200E+03
1970.199707
b = 1.970200E+03
0 10001001 11101100100011001100110
1.970200E+03
1970.199951
c = fabsf(a - b)
0 01110011 00000000000000000000000
2.441406E-04
0.000244
true
https://ideone.com/95cHD
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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