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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main(void) {
  5. 	double x;
  6.     while(scanf("%lf", &x)==1) {
  7.        if (x==0 || x!=x) {
  8.             printf("%g\n", x);
  9.             continue;
  10.        }
  11.        int exponent10 = floor(log10(fabs(x)));
  12.        double mantisa10 = x / pow10(exponent10);
  13.        if (fabs(mantisa10)>=9.999995) {
  14.             exponent10++;
  15.             mantisa10/=10;
  16.        }
  17.        printf("%ge%+d\n", mantisa10, exponent10);
  18.     }
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0s 2300KB
comments (?)
stdin
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9.99999
9.999999
9.99999999999
9.999995
9.9999949
1.0e0
1.0e-5
1.0e5
5.005
-50000.4
2.99999e33
0.0000000000001000001
-3e-33
stdout
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9.99999e+0
1e+1
1e+1
1e+1
9.99999e+0
1e+0
1e-5
1e+5
5.005e+0
-5.00004e+4
2.99999e+33
1e-13
-3e-33
https://ideone.com/sDXe08
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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