Program to find the value of integration using Simpson's 1/3 rule

!       Program to find the value of integration using Simpson's 1/3 rule
       write(*,*)'Enter the values of lower and upper limit of integration respectively:'
        read(*,*)a,b
        k=4
        write(*,*)'Enter the number of even sub intervals:'
        read(*,*)n
        sum=f(a)+f(b)
        h=(b-a)/n
        do i=1,n-1
        sum=sum+k*f(a+i*h)
        k=6-k
        end do
        sum=sum*h/3.0
        write(*,10)sum
10    format(2x,'The value of integration is',f16.3)
        end

!       Program sub function
        function f(x)
        f=sqrt(x)*exp(-x)
        return
        end

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Use of TClonesArray Class

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