Bifalgorithm post · Computer science one · Computing Quadratic Roots

How does PHP compute the roots of a quadratic equation?

How does PHP compute the roots of a quadratic equation? (Computer science one · Computing Quadratic Roots) — "We need to take care that we correctly adapt the…

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Programa PHP para calcular las raíces de una ecuación cuadrática
Solicita y convierte los coeficientes a, b y c
Introduce el coeficiente a
Introduce el coeficiente b
Introduce el coeficiente c
Adapta la fórmula cuadrática para reflejar correctamente el orden de las operaciones
Utiliza la función sqrt() de la biblioteca matemática
Calcula root1 con la suma de la raíz cuadrada
Calcula root2 con la resta de la raíz cuadrada
Imprime los coeficientes y las dos raíces mediante printf()
El programa completo aparece en el ejemplo de código 37.5

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How does PHP compute the roots of a quadratic equation?

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Computer science one

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sam23

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"We need to take care that we correctly adapt the formula so it accurately reflects the order of operations. We also need to use the math library’s square root function.\n\n$root1 = (-$b + sqrt($b*$b - 4*$a*$c) ) / (2*$a);\n\n$root2 = (-$b - sqrt($b*$b - 4*$a*$c) ) / (2*$a);\n\nFinally, we print the output using printf(). The full program can be found in Code Sample 37.5.\n\n<?php\n\n/**\n\n* This program computes the roots to a quadratic equation\n\n* using the quadratic formula.\n\n*/\n\nprintf(\"Please enter a: \");\n\n$a = floatval(trim(fgets(STDIN)));\n\nprintf(\"Please enter b: \");\n\n$b = floatval(trim(fgets(STDIN)));\n\nprintf(\"Please enter c: \");\n\n$c = floatval(trim(fgets(STDIN)));\n\n$root1 = (-$b + sqrt($b*$b - 4*$a*$c) ) / (2*$a);\n\n$root2 = (-$b - sqrt($b*$b - 4*$a*$c) ) / (2*$a);\n\nprintf(\"The roots of %fx^2 + %fx + %f are:\n\n\", $a, $b, $c);\n\nprintf(\" root1 = %f\n\n\", $root1);\n\nprintf(\" root2 = %f\n\n\", $root2);\n\n?>\n\nCode Sample 37.5.: Quadratic Roots Program in PHP"

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