Write a C++ program to find the roots of and quadratic equation of type ax2+bx+c where a is not equal to zero.

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Assignments » Flow Of Control » Set 1 » Solution 10

#include<iostream>
#include<math.h>
using namespace std;


int main()
{
 float a,b,c,d,root1,root2;
 cout<<"Enter value of  a, b and c : ";
 cin>>a>>b>>c;

 d=b*b-4*a*c;

 if(d==0)
 {
  root1=(-b)/(2*a);
  root2=root1;
  cout<<"Roots are real & equal";
   }
 else if(d>0)
 {
  root1=-(b+sqrt(d))/(2*a);
  root2=-(b-sqrt(d))/(2*a);
  cout<<"Roots are real & distinct";
 }
 else
 {
  root1=(-b)/(2*a);
  root2=sqrt(-d)/(2*a);
  cout<<"Roots are imaginary";
 }

 cout<<"\nRoot 1= "<<root1<<"\nRoot 2= "<<root2;


 return 0;
}

  The Output Is:  


SAMPLE RUN # 1

Enter value of a, b and c : 1.0 -10.0 25.0
Roots are real & equal
Root 1= 5
Root 2= 5

SAMPLE RUN # 2

Enter value of a, b and c : 1.0 5.0 2.0
Roots are real & distinct
Root 1= -4.56155
Root 2= -0.438447

SAMPLE RUN # 3

Enter value of a, b and c : 1.0 2.0 5.0
Roots are imaginary
Root 1= -1
Root 2= 2