Java学习的第五十四天

1.例13.1二次函数的解

import java.util.Scanner;
public class Cjava {
public static void main(String[]args) {
float a,b,c,disc;
System.out.println("input a,b,c:");
Scanner s=new Scanner(System.in);
a=s.nextFloat();
b=s.nextFloat();
c=s.nextFloat();
if(a==0) {
    System.out.println("a is equal to zero,error!");
}
else
    if((disc=b*b-4*a*c)<0) {
        System.out.println("disc<0");
    }
    else {
        System.out.println("x1="+((-b+Math.sqrt(disc))/(2*a)));
        System.out.println("x2="+((-b-
                Math.sqrt(disc))/(2*a)));
    }
    }
}

 2.没问题

3.明天继续写例题