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October 16, 2012 11:42
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ecuación de segundo grado con función
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// ecu2gradofun.cpp | |
// juanfc 2009-11-07 | |
// | |
#include <iostream> | |
#include <cmath> | |
using namespace std; | |
enum TIPOEC {CUALX, ABSURDA, PRIMERG, DOBLE, IMAG, DOSSOLS}; | |
TIPOEC ecu2grado(const float a, const float b, const float c, | |
float& x1, float& x2) | |
{ | |
TIPOEC tipo; | |
if (a == 0.0 and b == 0.0 and c == 0.0) { | |
tipo = CUALX; | |
} else { | |
if (a == 0.0) { // no es una ec. de seg. grado | |
if (b == 0.0) { // a=0, b=0 y c != 0 | |
tipo = ABSURDA; | |
} else { | |
tipo = PRIMERG; | |
x1 = -c/b; | |
} | |
} else { | |
float discr = b * b - 4.0 * a * c; | |
if (discr == 0.0) { | |
tipo = DOBLE; | |
x2 = x1 = -b/(a*2); | |
} else { | |
if (discr < 0.0) { | |
x1 = -b/(2*a); | |
x2 = sqrt(-discr)/(2*a); | |
tipo = IMAG; | |
} else { | |
float d = sqrt(discr); | |
tipo = DOSSOLS; | |
x1 = (-b+d)/(2*a); | |
x2 = (-b-d)/(2*a); | |
} | |
} | |
} | |
} | |
return tipo; | |
} | |
int main(int argc, char *argv[]) | |
{ | |
float a, b, c, x1, x2; | |
cout << "Resolvedor de ecuaciones del tipo ax2 + bx + c = 0" << endl; | |
cout << "Introduce a b c: "; | |
cin >> a >> b >> c; | |
switch (ecu2grado(a, b, c, x1, x2)) { | |
case CUALX: | |
cout << "Válida para cualquier x" << endl; | |
break; | |
case ABSURDA: | |
cout << "Imposible para ningún x" << endl; | |
break; | |
case PRIMERG: | |
cout << "Una sóla solución x: " << x1 << endl; | |
break; | |
case DOBLE: | |
cout << "Una solución doble x1=x2= " << x1 << endl; | |
break; | |
case IMAG: | |
cout << "Solución compleja conjugada: " | |
<< x1 << " +- i " << x2 << endl; | |
break; | |
case DOSSOLS: | |
cout << "Dos soluciones diferentes:" << endl; | |
cout << "x1: " << x1 << endl; | |
cout << "x2: " << x2 << endl; | |
break; | |
} | |
return 0; | |
} |
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