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#include <iostream> #include <cstdio> #include <cmath> using namespace std; //Q1 double quad(double a, double b, double c, double &r1, double &r2); //input:a,b,c //output: r1,r2 //call-by-value: a,b,c //call-by-reference: r1,r2 double quad(double a, double b, double c, double &r1, double &r2){ r1 = -b + sqrt( pow(b,2) - 4*a*c )/ (2*a); r2 = -b - sqrt( pow(b,2) - 4*a*c )/ (2*a); if(!r1 || !r2) { cout << "error the root doesn't exist"; return 1; } else return 0; }
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