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CAdvanced Functions ❯ Quadratic Equation
<06.01>
/* Problem: This program shows a function that generates two results. One result is returned (-), the other accessed from the main via an address (+). */ #include <stdio.h> #include <math.h> double quadratic (int a, int b, int c, double* xplus) { double xminus; xminus = (-b - sqrt (b * b - 4 * a * c))/ (2 * a); *xplus = (-b + sqrt (b * b - 4 * a * c))/ (2 * a); return (xminus); } int main (void) { int a = 10, b = 40, c = 30; double xplus, xminus; /* calling the function. the address of xplus is sent as an argument */ xminus = quadratic (a, b, c, &xplus); printf ("Using +: %lf\n", xplus); printf ("Using -: %lf\n", xminus); return (0); }
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Using +: -1.000000 Using -: -3.000000
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