C++ Program for Solving a Quadratic Equation

AIM

Write and execute a C++ program to solve the quadratic equations.

• X²-10x+24=0
•  X²-10x+25=0
•  X²-10x+30=0

PROGRAM

#include<iostream>

#include<math.h>        // for sqrt()

#include<stdlib.h>     // for abs()

using namespace std;

int main()

{

float a,b,c,r1,r2,d,r,i1,i2,d1;

char ans;

start:                     // label

cout<<"\n\nEnter the three coefficients a,b & c:";

cin>>a>>b>>c;

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

if(d<0)

{

cout<<"\n\nThe roots are imaginary\n";

d1=abs(d);

i1=-b/(2*a);

i2=sqrt(d1)/(2*a);

cout<<"\nRoot i1 = "<<i1<<"+i x "<<i2;

cout<<"\nRoot i2 = "<<i1<<"-i x "<<i2<<"\n";

}

else if(d==0)

{

r=-b/(2*a);

cout<<"\n\nThe roots are real and equal\n"<<"\nRoot="<<r<<"\n";

}

else

{

r1=(-b+sqrt(d))/(2*a);

r2=(-b-sqrt(d))/(2*a);

cout<<"\nThe roots are real and distinct\n"<<"\nRoot r1="<<r1<<"\nRoot r2="<<r2<<"\n";

}

cout<<"\n\nWould you like to run program again?(y/n):";

cin>>ans;

if(ans=='y')

goto start;              // goto label ‘start’

else

return(0);

}

OUTPUT

Enter the three coefficients a,b & c:1

-10

24

The roots are real and distinct

Root r1=6

Root r2=4

Would you like to run program again?(y/n):y

Enter the three coefficients a,b & c:1

-10

25

The roots are real and equal

Root=5

Would you like to run program again?(y/n):y

Enter the three coefficients a,b & c:1

-10

30

The roots are imaginary

Root i1 = 5+i x 2.23607

Root i2 = 5-i x 2.23607

Would you like to run program again?(y/n):n




Tags:
MG University Practical Exam, Quadratic Equation, C++