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求方程ax2 bx c=0的实数根。a, b, c由键盘输入, a!=0。若只有一个实数根(b2-4ac=0)则只输出x1,若无实数根(b2-4ac<0)则输出Error。 输入 2.5 7.5 1.0 输出 (注意等号前面后面都有一个空格) x1 = -0.139853 x2 = -2.860147
代码语言:javascript复制import java.util.*;
public class P0104 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
double a = sc.nextDouble();
double b = sc.nextDouble();
double c = sc.nextDouble();
double x = b * b - 4 * a * c;
if (x < 0) {
System.out.println("Error");
} else if (x == 0) {
double result = (-b - Math.sqrt(x)) / (2 * a);
System.out.printf("x1 = %.6f
",result);
} else {
double result1 = (-b Math.sqrt(x)) / (2 * a);
double result2 = (-b - Math.sqrt(x)) / (2 * a);
System.out.printf("x1 = %.6f
",result1);
System.out.printf("x2 = %.6f",result2);
}
}
}