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Program to find the digits of a given number and their sum

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C      Program to find the digits of a given number and their sum
        write(*,*)'Enter the integer:'
        read(*,*)n
        m=n
        sum=0
        if (n.eq.0)then
        write(*,*)'The number is',n
        write(*,*)'The sum is',sum
        else
        write(*,*)'The digits are given below :'
        do while (n.ne.0)
        r=abs(mod(n,10))
        write(*,*)r
        sum=sum+r
        n=n/10
        end do
        write(*,*)'The sum is',sum
        end if
        end
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