Saturday, 19 July 2014

Write a c/c++ code that will calculate the roots of a quadratic equation a^2+ bx+c=0 Hint: d = sqrt (b2-4ac), and the roots are: x1 = (–b + d)/2a and x2 = (–b – d)/2a (use sqrt function from cmath.h )

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#include<iostream>
#include<conio.h>
#include<cmath>
using namespace std;
int main()
{
    float a,b,c,diff,X1,X2;
    char yes='y';
    char no='n';
    cout << "\t\t\t Problem-1\n\n";        // user prompt
    while(yes!=no)                            // Starting and conditon of loop.
    {
    cout<<"Please Enter the Value of A = ";
        cin>>a;
    cout<<"Please Enter the Value of B = ";
        cin>>b;
    cout<<"Please Enter the Value of C = ";
        cin>>c;
    diff=(b*b)-(4*a*c);
        if(diff==0)
            {
                X1=(-b)/(2*a);
                X2=X1;
                cout<<"\nThe Roots are Simple and Equal";
              }
        if(diff>0)
            {
                X1=-(b+sqrt(diff))/(2*a);
                X2=-(b-sqrt(diff))/(2*a);
                cout<<"\nThe Roots are Complex and Not Equal";
            }

        if(diff<0)
            {
                X1=(-b)/(2*a);
                X2=sqrt(-diff)/(2*a);
                cout<<"\nThe Roots are Complex and Not Equal";
            }
    cout<<"\nThe X1 is = "<<X1;
    cout<<"\nThe X2 is = "<<X2;
    cout<<"\nDo you want to re-calculate? if yes then press \"y\" else press \"n\""; //user prompt
        cin>>yes;
    }
    getch();
}



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