125 lines
5.1 KiB
Java
125 lines
5.1 KiB
Java
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//This is a java program to find the solution to the linear equation in single variable
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import java.util.Scanner;
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public class LEquation
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{
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public static void main(String args[])
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{
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String eqn = "";
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float ans = 0;
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float coeffSum = 0;
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float constSum = 0;
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float coeffx[] = new float[100];
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float[] constant = new float[100];
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Scanner in = new Scanner(System.in);
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System.out.println("Enter a linear equation\n");
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eqn = in.nextLine();
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eqn += "\n";
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// System.out.println(eqn);
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for (int i = 0, j = 0, k = 0; i < eqn.length() - 1;)
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{
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if (eqn.charAt(i + 1) == 'x' && i < eqn.indexOf("="))
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{
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if (i != 0 && eqn.charAt(i - 1) == '-')
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = -(Integer.parseInt(x, 10));
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coeffx[j++] = n;
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}
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}
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else
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = Integer.parseInt(x, 10);
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coeffx[j++] = n;
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}
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}
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i += 3;
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}
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if (eqn.charAt(i + 1) == 'x' && i > eqn.indexOf("="))
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{
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if (eqn.charAt(i - 1) == '-')
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = Integer.parseInt(x, 10);
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coeffx[j++] = n;
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}
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}
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else
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = -(Integer.parseInt(x, 10));
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coeffx[j++] = n;
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}
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}
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i += 3;
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}
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if (eqn.charAt(i + 1) != 'x' && i < eqn.indexOf("="))
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{
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if (eqn.charAt(i - 1) == '-')
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = -(Integer.parseInt(x, 10));
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constant[k++] = n;
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}
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}
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else
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = Integer.parseInt(x, 10);
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constant[k++] = n;
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}
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}
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i += 2;
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}
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if (eqn.charAt(i + 1) != 'x' && i > eqn.indexOf("="))
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{
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if (eqn.charAt(i - 1) == '-')
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = Integer.parseInt(x, 10);
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constant[k++] = n;
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}
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}
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else
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{
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String x = eqn.substring(i, i + 1);
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if (x != "+" && x != "-")
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{
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int n = -(Integer.parseInt(x, 10));
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constant[k++] = n;
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}
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}
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i += 2;
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}
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}
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for (int i = 0; i < coeffx.length; i++)
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coeffSum += coeffx[i];
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for (int i = 0; i < constant.length; i++)
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constSum += constant[i];
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ans = constSum / coeffSum;
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System.out.println("Value of x = " + (-ans));
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in.close();
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}
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}
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/*
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Enter a linear equation
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2x+5=4x+9
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Value of x = -2.0
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