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  1. #include <stdio.h>
  2.  
  3. char *get_number_formatted(double f)
  4. {
  5.     static char buf[128]; // this function is not thread-safe
  6.     int i, j;
  7.  
  8.     i = snprintf(buf, 128, "%20.10f", f) - 2;
  9.  
  10.     for (j = i - 8; i > j; --i)
  11.         if (buf[i] != '0')
  12.             break;
  13.  
  14.     buf[i + 1] = '\0';
  15.     return buf;
  16. }
  17.  
  18. int main(void)
  19. {
  20. 	int i;
  21. 	for (i = -4; i < 5; ++i)
  22.         printf("%5d %s\n", i, get_number_formatted(pow(10.0, i)));
  23.     return 0;
  24. }
Success #stdin #stdout 0s 2008KB
comments ()
stdin
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Standard input is empty
stdout
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   -4         0.0001
   -3         0.001
   -2         0.01
   -1         0.1
    0         1.0
    1        10.0
    2       100.0
    3      1000.0
    4     10000.0
https://ideone.com/KBiSu0
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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