public class Main1 {
public static void main(String[] args) {
double a = 1.0;
double b = 3.0;
double c = -4.0;
// 求平方根可用 Math.sqrt():
// System.out.println(Math.sqrt(2)); ==> 1.414
// TODO:
double r1 = (-b-Math.sqrt(b*b-4*a*c))/(2*a);
double r2 = (-b+Math.sqrt(b*b-4*a*c))/(2*a);
System.out.println(r1);
System.out.println(r2);
System.out.println(r1 == 1 && r2 == -4 ||r1 == -4 && r2 == 1? "测试通过" : "测试失败");
}
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这是一个幼稚的ID
public class Main1 {
public static void main(String[] args) {
double a = 1.0;
double b = 3.0;
double c = -4.0;
// 求平方根可用 Math.sqrt():
// System.out.println(Math.sqrt(2)); ==> 1.414
// TODO:
double r1 = (-b-Math.sqrt(b*b-4*a*c))/(2*a);
double r2 = (-b+Math.sqrt(b*b-4*a*c))/(2*a);
System.out.println(r1);
System.out.println(r2);
System.out.println(r1 == 1 && r2 == -4 ||r1 == -4 && r2 == 1? "测试通过" : "测试失败");
}
}