关于二次方程式(在此处了解更多:http://www.mathsisfun.com/algebra/quadratic-equation.html)。我把等式的a,b和c作为输入。
样本方程式为:21x ^ 2 - 8x - 4 这里,a = 21,b = -8,c = -4。所以,在解决(没有公式), => 21x ^ 2 - 14x + 6x - 4 = 0.
我需要两个中间数字,即在这种情况下为14和6(读取因子)。我认为我做的都是正确的,但输入似乎是无限的,并没有停止。你能纠正这个错误吗?我也很想知道为什么会这样。
import java.util.Scanner;
public class QuadFact {
static Scanner sc = new Scanner(System.in);
static int a,b,c;
static int P, diff, p;
static int i;
static boolean found = false;
void accept(){
System.out.println("Enter the a, b, c");
a = sc.nextInt(); b = sc.nextInt(); c = sc.nextInt();
}
void compute(){
P = a * c;
diff = 0;
while(!found){
for (i = b + 1;;i++){
diff = i - b;
p = i * diff;
if (p==P) {
found = true;
break;
}
}
}
}
void display(){
System.out.print("These are the raw numbers, should be correct.
Still,\n it is advisable you verify it.");
System.out.println("One factor: " + i);
System.out.println("Other factor: " + diff);
}
public static void main(String[] args){
QuadFact a = new QuadFact();
a.accept();
a.compute();
a.display();
}
}
答案 0 :(得分:1)
好的,我为此写了一个代码。
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
//Declare and get the variables
int a, b,c;
Scanner s = new Scanner(System.in);
System.out.println("Enter A");
a = s.nextInt();
System.out.println("Enter B");
b = s.nextInt();
System.out.println("Enter c");
c = s.nextInt();
//A should be 1 if not divide a, b and c by a
if (a>1) {
b= b/a;
c=c/a;
a= a/a;
}
//Just printing what the values of ABC IS AGAIN
System.out.println("A = "+a+" B = "+b+" C = "+c);
//Just printing what the values of ABC IS AGAIN but in reverse, that is if c was 5 it becomes -5
//another way to reverse positive to negative and vice versa
System.out.println("A = "+(0-a)+" B = "+(0-b)+" C = "+(0-c));
//Set i as c and start the loop from highest to lowest.
for (int i = Math.abs(c); i>0 ;i-- ) {
//if a multiple is found it proceeds and checks for the
//multiple combination that when multiplied you get C and the addition or subtraction gives you B
if (c%i==0) {
int fac1 = c/i;
//Displays the multiples found
System.out.println(i+" x "+fac1+" = "+c);
//There are 4 possible outcomes or cases
//case 1 multiple 1 - multiple 2 = b
//case 2 multiple 2 - multiple 1 = b
//case 3 multiple 1 + multiple 2 = b
//case 4 -multiple 1 + -multiple 2 = b
if (i-fac1 == b) {
//System.out.println("case 1: " + i+"-"+fac1+"="+b);
answer(i,fac1);
break;
}
else if(fac1 - i == b){
//System.out.println("case2: " + fac1+"-"+i+"="+b);
answer(fac1,i);
break;
}
else if (i +fac1 == b ) {
//System.out.println("case3: " + i+"+"+fac1+"="+b);
answer(i,fac1);
break;
}
else if((0-Math.abs(i)) + (0- Math.abs(fac1))==b) {
//System.out.println("case4: "+"-"+i+ " + "+ "-"+ fac1 +"="+b);
answer((0-Math.abs(i)),(0- Math.abs(fac1)));
break;
}
else {
System.out.println("Probably not a factorizable Equation");
}
}
}
}
//Use this method to show the final answer
private static void answer(int f1, int f2) {
System.out.println("x = "+(0-f1) +" or x = "+(0-f2));
}
}
答案 1 :(得分:0)
我认为你必须在两边看""对于一个因子对,它加起来为b并产生产品a * c。
void compute(){
P = a * c;
while(!found){
for( i = 1; ; i++ ){
diff = b - i;
if (i * diff == P) {
found = true;
break;
}
diff = b + i;
if (-i * diff == P) {
found = true;
break;
}
}
}
}