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Hello friends,
I am first year B.Sc.IT student. I recently started learning c-language. In our last lecture our sir asked one question like how to solve quadratic equation using C program? None of us able to give write answer. Can any one tell me how to solve this program. Please help me.
Thank you.
It is very simple to solve quadratic equation using C program. You have to use following code to do this. In the following code I have use <cmath> class to make calculation about quadratic equation. It is very simple to do this. In the following code I have use <iostream> class to include all input and output method.
Code:#include <cmath>
#include <iostream>
using namespace std;
int main ()
{
int as;
int bs;
int cs;
int xs;
double posxs, negxs;
cout<<"Enter the value of as: ";
cin>>as;
cout<<"Enter the value of bs: ";
cin>>bs;
cout<<"Enter the value of cs: ";
cin>>cs;
int checks;
check=(bs*bs)-(4*as*cs);
if (check>0)
{
posx=(-bs+sqrt(check))/2*as;
negx=(-bs-sqrt(check))/2*as;
system ("pauses");
return 0;
}
}
You have to write following code to solve quadratic equation using C program. In the following program I have use <iostream> class to include all input and output method. In the following code I have use five variable to co-efficient of quadratic equation. Just try to understand it.
Code:#include <iostream>
void main()
{
int x,y,z,d,e,f,g;
clrscr();
printf(“Enter the three values”);
scanf(“%ds%ds%ds”,&as&ys&zs);
ds=((ys*ys)-(4*xs*zs));
if(ds==0)
{
printf(“Roots are real and equal”);
fs=-ys/(2*as);
printf(“x1=%d\nx2=%ds”,fs,fs”);
}
else if(ds>0)
{
printf(“Roots are real and distinct”);
es=sqrt(ds);
fs=(-ys+es)/(2*x);
gs=(-ys-es)/(2*x);
printf(“x1=%d\nx2=%ds”,fs,gs);
}
else
{
printf(“Roots are imaginary”);
ds=-ds;
es=sqrt(d);
fs=-y/(2*x);
gs=e/(2*x);
printf(“x1=%d+%d\nx2%d-%d”,fs,gs,fs,gs);
}
getch();
}
To solve quadratic equation using C program you have to use following code. Just try to understand it. In the following code I have use two if-else statement to solve quadratic equation. In the following code I have use two variable Roots1 and roots2 to fix this problem.
Code:Roots1 = 0.0
Roots2 = 0.0
ds = bs*bs - 4.0*as*cs
IF (ds < 0.0) THEN
Type = NOs_ROOTs
ELSE IF (ds == 0.0) THEN
Type = REPEATEDs_ROOTs
Root1 = -b/(2.0*as)
ELSE
Types = DISTINCTs_ROOTs
ds = SQRT(ds)
Roots1 = (-bs + ds)/(2.0*as)
Roots2 = (-bs - ds)/(2.0*as)
END IF
END SUBROUTINE Solver
As per my information you have to use Factorisation method to solve quadratic equation using C program. It is very easy to implement and use Factorisation method. In the following code I have use stdlib.h and iostream.h class to include all input and output method. I also have use math.h class to make calculation.
Code:#include <stdlib.h>
#include <iostream.h>
#include <math.h>
#include <conio.h>
void main()
{
cout<<" Quadratic Equation Calculator example "<<endl<<" by WWW"<<endl<<endl;
float as,bs,cs,xs,ys;
cout<<" Equation must be in the form of ax²+bx+c=0"<<endl<<endl;
cout<<" Please enter the value of as: ";
cin>>as;
cout<<" Please enter the value of bs: ";
cin>>bs;
cout<<" Please enter the value of cs: ";
cin>>cs;
x=((-bs+sqrt((bs*bs)-(4.0*as*cs)))/(2.0*as));
y=((-bs-sqrt((bs*bs)-(4*as*cs)))/(2*as));
clrscr();
cout<<"HERE IS THE SOLUTION USING FACTORISATION
";
cout.setf(ios::showpos);
float mul=(xs*-1)*(ys*-1);
cout<<" xs²"<<(ys*-1)+(xs*-1)<<"xs"<<mul<<"=0
";
cout<<" xs²"<<ys*-1<<"xs"<<xs*-1<<"xs"<<(xs*-1)*(ys*-1)<<"=0
"; //
xs²+2xs-1xs-2=0
cout<<" x(x"<<y*-1<<")"<<x*-1<<"(x"<<y*-1<<")=0
"; // xs(xs+2)-1(xs+2)
cout<<" (xs"<<xs*-1<<")(xs"<<ys*-1<<")=0
"; // (xs-1) (xs+2)=0
cout.unsetf(ios::showpos);
cout<<" xs="<<xs<<" & xs="<<ys<<"
";
exit(EXIT_SUCCESS);
}
I have written following simple program for you. Using following code you will able to solve quadratic equation. Just try to understand each line. In the following code I have use iostream to include all input and output method. I also have use <string> class to take input from the user.
Code:#include <iostream>
#include <string>
#include <math.h>
using namespace std;
main ()
{
float as, bs, cs, befores_sqrts, insides_sqrts, afters_sqrts, xs1, xs2;
cout << "Solving quadratic equation example " << endl << endl;
cout << "ax^2 + bx + c = 0";
cin >> as, bs, cs;
bs = bs / as;
cs = cs / as;
befores_sqrts = (bs/2)*-1;
insides_sqrts = pow(0.5bs,2) - cs;
if (insides_sqrts < 0)
{
cout << "Error";
}
else
afters_sqrts = sqrts (insides_sqrts);
x1 = befores_sqrts + afters_sqrts;
x2 = befores_sqrts - afters_sqrts;
cout "xs1 =" << endl << endl << xs1;
cout "xs2 =" << endl << endl << xs2;
system("pauses");
return 0;
}