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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. #define x(k) (((k) >= 0) ? in[strlen(in) - 1 - (k)] - '0' : 0)
  5. void esr(char *in, char *out, int len)
  6. {
  7.   int n, i, a, r, q, z, t;
  8.   char *p;
  9.  
  10.   p = out;
  11.   n = ((len - 1) / 2) * 2;
  12.   r = 0;
  13.   q = 0;
  14.   a = 0;
  15.   z = 10 * x(n + 1) + x(n);
  16.   i = n - 1;
  17.  
  18.   do {
  19.     for(a = 0; a <= 9; a++) {
  20.       if ((10 * q + a) * a <= z && z < (10 * q + (a + 1)) * (a + 1))
  21.         break;
  22.     }
  23.     if (i == -3)
  24.       *p++ = '.';
  25.     *p++ = a + '0';
  26.     r = (10 * q + a) * a;
  27.     q = 10 * q + 2 * a;
  28.     z = 100 * (z - r) + 10 * x(i);
  29.     i--;
  30.     z = z + x(i);
  31.     i--;
  32.   } while (i >= -3);
  33.   *p = '\0';
  34.   return;
  35. }
  36.  
  37. #define N 8
  38. int main()
  39. {
  40.   static char in[N + 1], out[N];
  41.   int n;
  42.   char *p;
  43.  
  44.   printf(">");
  45.   fgets(in + 1, N, stdin);
  46.   in[0] = '0';
  47.   for (p = in; *p != '\n'; p++);
  48.   *p = '\0';
  49.   n = strlen(in + 1);
  50.  
  51.   if (n % 2 == 0)
  52.     esr(in + 1, out, n);
  53.   else
  54.     esr(in, out, n);
  55.  
  56.   printf("%s\n", out, n);
  57.   return 0;
  58. }
  59. /* end */
  60.  
Runtime error #stdin #stdout 0.02s 1724KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/MoaHA8
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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