C++ program to find the roots of a quadratic equation.

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#include<iostream.h> #include<conio.h> #include<math.h> #include<process.h> void main() { float a,b,c,root1,root2,delta; char choice; do { clrscr(); cout<<"ENTER THE VALUES FOR THE VARIABLESIN EQUATION : ax^2 + bx + c :"; cout<<"\nENTER a : "; cin>>a; cout<<"\nENTER b : "; cin>>b; cout<<"\nENTER c : "; cin>>c; if(!a) { cout<<"\nINVALID ENTRYFOR a."; exit(0); } delta=(b*b)-(4*a*c); if(delta<0) cout<<"\nIMAGINARY ANDCOMPLEX ROOTS."; else if (delta>0) { root1=(-b+sqrt(delta))/(2*a); root2=(-b-sqrt(delta))/(2*a); cout<<"\nROOTS ARE REAL AND UNEQUAL."<<endl; cout<<"\nROOTS ARE : "<< root1 << "\t" <<root2; } else if(delta==0) { root1=(-b/(2*a)); root2=root1; cout<<"\nROOTS ARE REAL AND EQUAL."<<endl; cout<<"\nROOTS ARE : "<< root1 << "\t" <<root2; } cout<<"\n\nDO YOU WANT TO CONTINUE (Y/N) : "; cin>>choice; }while(choice=='y'||choice=='Y'); }

OUTPUT

ENTER THE VALUES FOR THE VARIABLESIN EQUATION : ax^2 + bx + c : ENTER a : 3 ENTER b : 5 ENTER c : 2 ROOTS ARE REAL AND UNEQUAL. ROOTS ARE : -0.666667 -1 DO YOU WANT TO CONTINUE (Y/N) : n