Quadratic equation

Program to find roots of a quadratic equation (JAVA )

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import java.lang.Math;
class quad
{
public static void main(String ar[])
{ float a,b,c,d;
double d1,r1,r2;
a=Float.valueOf(ar[0]).floatValue();
b=Float.valueOf(ar[1]).floatValue();
c=Float.valueOf(ar[2]).floatValue();
d=b*b-4*a*c;
if(d<0)
System.out.println(“NO real roots”);
else if(d==0)
{ System.out.println(“Equal roots”);
r1=-b/(2*a);
System.out.println(“Roots are: “+ r1 + “,”+ r1);
}
else
{ System.out.println(“Real roots”);
d1=Math.sqrt(d);
r1=-b+d1/(2*a);
r2=-b-d1/(2*a);
System.out.println(“Roots are: “+ r1 + “,”+ r2);
}
}
}

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Program to find roots of a quadratic equation .

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images (5)
#include<stdio.h>
#include<math.h>
int main(){
  float a,b,c;
  float d,root1,root2;
  printf(“Enter a, b and c of quadratic equation: “);
  scanf(“%f%f%f”,&a,&b,&c);
  d = b * b – 4 * a * c;
  if(d < 0){
    printf(“Roots are complex number.\n”);
    printf(“Roots of quadratic equation are: “);
    printf(“%.3f%+.3fi”,-b/(2*a),sqrt(-d)/(2*a));
    printf(“, %.3f%+.3fi”,-b/(2*a),-sqrt(-d)/(2*a));
    return 0;
  }
  else if(d==0){
   printf(“Both roots are equal.\n”);
   root1 = -b /(2* a);
   printf(“Root of quadratic equation is: %.3f “,root1);
   return 0;
  }
  else{
   printf(“Roots are real numbers.\n”);
   root1 = ( -b + sqrt(d)) / (2* a);
   root2 = ( -b – sqrt(d)) / (2* a);
   printf(“Roots of quadratic equation are: %.3f , %.3f”,root1,root2);
  }
  return 0;
}
Sample output:
Enter a, b and c of quadratic equation: 2 4 1
Roots are real numbers.
Roots of quadratic equation are: -0.293, -1.707

 

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