Program to find the root of the quadratic equation

C      Program to find the root of the quadratic equation
        write(*,*)'Enter the values of a,b,c'
        read(*,*)a,b,c
        d=b*b-(4.0*a*c)
        if (d.eq.0)then
        write(*,*)'The root is real and equal.'
        x1=-b/(2.0*a)
        write(*,*)'The equal root is :',x1
        else if (d.gt.0)then
        write(*,*)'The roots are real and distinct.'
        x1=(-b+sqrt(d))/(2.0*a)
        x2=(-b-sqrt(d))/(2.0*a)
        write(*,*)'The roots are :',x1,' and ',x2
        else
        write(*,*)'The roots are distinct but imaginary.'
        x1=(-b)/(2.0*a)
        x2=sqrt(-d)/(2.0*a)
        write(*,*)'The first root is :',x1,'+i',x2
        write(*,*)'The second root is :',x1,'-i',x2
        end if
        end

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How to Install CERN ROOT on Ubuntu: A Step-by-Step Guide

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Use of TClonesArray Class

void write { TClonesArray * arr = new TClonesArray ( " TVector3 " ); TClonesArray & ar = * arr ; TFile * file = new TFile ( " file.root " , " recreate " ); TTree * tree = new TTree ( " tcl " , " tcl " ); tree -> Branch ( " array " , & arr ); TRandom2 * rand = new TRandom2 ( 1 ); for ( int i = 0 ; i < 100 ; i ++) { arr -> Clear (); for ( int j = 0 ; j < 1000 ; j ++) { double x = rand -> Rndm (); double y = rand -> Rndm (); double z = rand -> Rndm (); new ( ar [ j ]) TVector3 ( x , y , z ); } tree -> Fill (); } file -> Write (); file -> Close (); } void read () { TFile * file = new TFile ( " file.root " ); TTree * tree = ( TTree *) file -> Get ( " tcl " ); TClonesArray * arr = new ...

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