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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. void putll(long long n)
  5. {
  6. 	char r = n % 10;
  7. 	if (n >= 10) {
  8. 		putll(n / 10);		
  9. 	}
  10. 	putchar('0' + r);
  11. }
  12.  
  13. void putdouble(double d)
  14. {
  15. 	double x = d;
  16. 	long long l;
  17. 	int i;
  18. 	char n;
  19.  
  20. 	if (x < 0) { // 負ならマイナス符号を出力してxの正負反転
  21. 		putchar('-'); 
  22. 		x *= -1;
  23. 	}
  24. 	l = floor(x); // xの整数部分
  25. 	putll(l);
  26.  
  27. 	putchar('.');
  28.  
  29. 	x -= l; // 小数部分を取り出す
  30. 	for (i=0; i<6; ++i) { // 小数部は6桁表示
  31. 		x *= 10;
  32. 		n = floor(x);
  33. 		putchar ('0' + n);
  34. 		x -= n;
  35. 	}
  36. 	putchar('\n');
  37. }
  38.  
  39. int main(void) {
  40.  
  41. 	putdouble(-123.000123);
  42. 	putdouble(123123);
  43. 	putdouble(1.0/7.0);
  44.  
  45. 	return 0;
  46. }
  47.  
  48.  
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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-123.000123
123123.000000
0.142857
https://ideone.com/jWOJDC
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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