39. Input any A, B, and C to find the root of the quadratic equation ax * x + bx + c = 0?

// From this question, you can familiarize yourself with the use of the header file # include <cmath> // 1. The question is relatively simple. You only need to use the judgment statement. // 2. Note, when declaring variables, you must think of root irrationality and pay attention to the forced type conversion of function results, SQRT only supports double and float types # include <iostream> # include <cmath> // some common functions such as using namespace STD; int main () {int A, B, C, d; float x1, x2, X3; cout <"Please input a, B and c:" <Endl; CIN> A> B> C; D = B * B-4 * a * C; If (D> 0) {x1 = (-B + (float) SQRT (D)/(2 * )); // when using the root number function, pay attention to forced type conversion X2 = (-B-(float) SQRT (D)/(2 * )); cout <"the equation has two solutions:" <Endl; Cout <"X1 =" <X1 <"X2 =" <X2 <Endl;} else if (D = 0) {cout <"the equation has a solution:" <Endl; X3 = (-B)/(2 * )); the cout <"x =" <X3 <Endl;} else {cout <"equation is not resolved. "<Endl;} return 0 ;}