Average Error: 29.5 → 0.2
Time: 17.0s
Precision: 64
\[\sqrt{x + 1} - \sqrt{x}\]
↓
\[\frac{1}{\sqrt{x + 1} + \sqrt{x}}\]
\sqrt{x + 1} - \sqrt{x}
↓
\frac{1}{\sqrt{x + 1} + \sqrt{x}}
double f(double x) {
        double r4636342 = x;
        double r4636343 = 1.0;
        double r4636344 = r4636342 + r4636343;
        double r4636345 = sqrt(r4636344);
        double r4636346 = sqrt(r4636342);
        double r4636347 = r4636345 - r4636346;
        return r4636347;
}
↓
double f(double x) {
        double r4636348 = 1.0;
        double r4636349 = x;
        double r4636350 = r4636349 + r4636348;
        double r4636351 = sqrt(r4636350);
        double r4636352 = sqrt(r4636349);
        double r4636353 = r4636351 + r4636352;
        double r4636354 = r4636348 / r4636353;
        return r4636354;
}

Error

Bits error versus x

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Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original29.5
Target0.2
Herbie0.2
\[\frac{1}{\sqrt{x + 1} + \sqrt{x}}\]

Derivation

  1. Initial program 29.5

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

  3. Applied flip--29.3

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

  4. Simplified0.2

    \[\leadsto \frac{\color{blue}{1 + 0}}{\sqrt{x + 1} + \sqrt{x}}\]

  5. Final simplification0.2

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

Reproduce

herbie shell --seed 2019162 
(FPCore (x)
  :name "2sqrt (example 3.1)"

  :herbie-target
  (/ 1 (+ (sqrt (+ x 1)) (sqrt x)))

  (- (sqrt (+ x 1)) (sqrt x)))