Program to find Roots of a quadratic equation.

.     

//Quadratic equation

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{

clrscr();

int a,b,c,d;

float rt1,rt2;

cout<<"Enter the values of a, b, c (Coefficients):";

cin>>a>>b>>c;

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

if(d==0)

{

cout<<"Roots are real & equal:";

rt1=rt2=-b/(2*a);

cout<<rt1<<","<<rt2;

}

else

if(d>0)

{

cout<<"Roots are real & unequal:";

rt1=(-b+sqrt(d))/2*a;

rt2=(-b-sqrt(d))/2*a;

cout<<rt1<<","<<rt2;

}

else

cout<<"Routs are imaginary:";

getch();

}

3.      Program to check whether the year is leap year or not

//Leap year

# include<iostream.h>

#include<conio.h>

void main ()

{

int yr;

clrscr ();

cout<<"Enter a year in four digits:";

cin>>yr;

if ((yr%4==0 &&yr%100!=0) || (yr%400==0))

cout<<"It is a leap year";

else

cout<<"It is not a leap year";

getch ();

}