Average Error: 13.6 → 0.1
Time: 21.3s
Precision: 64
\[\frac{1}{x + 1} - \frac{1}{x}\]
↓
\[\frac{\frac{-1}{x}}{x + 1}\]
\frac{1}{x + 1} - \frac{1}{x}
↓
\frac{\frac{-1}{x}}{x + 1}
double f(double x) {
        double r1570977 = 1.0;
        double r1570978 = x;
        double r1570979 = r1570978 + r1570977;
        double r1570980 = r1570977 / r1570979;
        double r1570981 = r1570977 / r1570978;
        double r1570982 = r1570980 - r1570981;
        return r1570982;
}
↓
double f(double x) {
        double r1570983 = -1.0;
        double r1570984 = x;
        double r1570985 = r1570983 / r1570984;
        double r1570986 = 1.0;
        double r1570987 = r1570984 + r1570986;
        double r1570988 = r1570985 / r1570987;
        return r1570988;
}

Error

Bits error versus x

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Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 13.6

    \[\frac{1}{x + 1} - \frac{1}{x}\]
  2. Using strategy rm

  3. Applied frac-sub13.0

    \[\leadsto \color{blue}{\frac{1 \cdot x - \left(x + 1\right) \cdot 1}{\left(x + 1\right) \cdot x}}\]

  4. Simplified0.5

    \[\leadsto \frac{\color{blue}{-1}}{\left(x + 1\right) \cdot x}\]

  5. Simplified0.5

    \[\leadsto \frac{-1}{\color{blue}{x + x \cdot x}}\]
  6. Using strategy rm

  7. Applied *-un-lft-identity0.5

    \[\leadsto \frac{-1}{\color{blue}{1 \cdot x} + x \cdot x}\]

  8. Applied distribute-rgt-out0.5

    \[\leadsto \frac{-1}{\color{blue}{x \cdot \left(1 + x\right)}}\]

  9. Applied associate-/r*0.1

    \[\leadsto \color{blue}{\frac{\frac{-1}{x}}{1 + x}}\]

  10. Final simplification0.1

    \[\leadsto \frac{\frac{-1}{x}}{x + 1}\]

Reproduce

herbie shell --seed 2019142 
(FPCore (x)
  :name "2frac (problem 3.3.1)"
  (- (/ 1 (+ x 1)) (/ 1 x)))