Java-Crash-Course/Task/Task1.java at master · sundramsinghdev007/Java-Crash-Course · GitHub

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//Develop a program in java which calculate roots of quadratic equation ax2+bx+c=0. Use Math.sqrt() function to calculate square root.

import java.util.*;

class root

{

public static void main(String... args)

{

double a,b,c,D,root1,root2,real,imaginary;

Scanner s=new Scanner(System.in);

System.out.print("Enter the coefficient of x*x of equation:");

a=s.nextInt();

System.out.print("Enter the coefficient of y of equation:");

b=s.nextInt();

System.out.print("Enter the indenpendent term of equation:");

c=s.nextInt();

D=b*b-4*a*c; //discriminat.

System.out.println("Discriminat. of equation:"+D);

if(D==0)

{

root1=(-b+Math.sqrt(D))/(2*a);

System.out.println("Roots are real and equal:"+"("+root1+","+root1+")");

}

else if(D>0)

{

root1=(-b+Math.sqrt(D))/(2*a);

root2=(-b-Math.sqrt(D))/(2*a);

System.out.println("Roots are real and equal:"+"("+root1+","+root2+")");

}

//when D<0 roots are imaginary

else

{

real=-b/(2*a);

imaginary=Math.sqrt(D)/(2*a);

System.out.println("Roots are imaginary:"+"("+real+","+imaginary+")");

}

The quantity b2 - 4ac inside the radical is called discriminat.

• If b2 - 4ac = 0, the roots are real and equal.

• If b2 - 4ac > 0, the roots are real and unequal.

• If b2 - 4ac < 0, the roots are imaginary.

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