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Im 방정식에서 a, b 및 c를 취하여이를 사용하여 수식을 사용하여 x를 찾으십시오. http://www.purplemath.com/modules/quads/qform01.gif.이차 방정식 프로그램 Java?
내가 얻는 문제는 1x^2 + 3x +4 방정식을 플러그인 할 때 x = 1 및 x = -4 대신 x = -Infinity 및 x = 무한대가됩니다.
는 Heres는 내 코드 :
클래스 1 :
public class quadratictest
{
public static void main(String args[])
{
DecimalFormat df = new DecimalFormat("#.###");
System.out.println("--------------------------------------------------");
System.out.println(" ~Quadratic Formula~");
System.out.println("--------------------------------------------------");
System.out.println("in a polynomial, there are 3 important numbers used");
System.out.println("to figure out x. they are a, b, and c, shown below.\n");
System.out.println("\t\t1x^2 +3x +4");
System.out.println("\t\t^ ^ ^");
System.out.println("\t\ta b c");
Scanner input = new Scanner(System.in);
System.out.print("\nPlease type a, b, and c here[a b c]: ");
int a = input.nextInt();
int b = input.nextInt();
int c = input.nextInt();
mathey quad = new quadsong(a,b,c);
System.out.println("------------");
System.out.println(quad.solveb());
System.out.println(quad.solvea());
//System.out.println("x =" +df.format(quad.solvea()));
//System.out.println("x =" +df.format(quad.solveb()));
System.out.println("------------");
}
}
클래스 2 :
import java.util.*;
import java.io.*;
import java.text.DecimalFormat;
/**
* Write a description of class quadsong here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class mathey
{
int a;int b;int c;
double solution1;
double solution2;
public mathey(int aN, int bN, int cN)
{
int a = aN;
int b = bN;
int c = cN;
solvea();
solveb();
}
public double solvea()
{
solution1 = ((b*-1) + Math.sqrt((b^2)-(4*a*c)))/(a+a);
if (solution1 == Math.floor(solution1))
{
return solution1;
}
else
{
return 0;
}
}
public double solveb()
{
solution2 = ((b*-1) - Math.sqrt((b^2)-(4*a*c)))/(2*a);
if (solution2 == Math.floor(solution2))
{
return solution2;
}
else
{
return 0;
}
}
}
은을 heres 내 출력 :
--------------------------------------------------
~Quadratic Formula~
--------------------------------------------------
in a polynomial, there are 3 important numbers used
to figure out x. they are a, b, and c, shown below.
1x^2 +3x +4
^ ^^
a b c
Please type a, b, and c here[a b c]: 1 3 4
------------
x =Infinity
x =-Infinity
------------
무슨 잘못이야? 미리 감사드립니다! 1 배^2 + 배 + 4 더 뿌리가 없습니다 : 코드 서식 죄송 P.S, 나는 하하
그래, 그게 ... 고마워. 하하 ... 지금 바보 같아. XD – malymieczek