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Prime factor of a given integer

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C      Prime factor of a given integer
        write(*,*)'Input an integer:'
        read(*,*)n
        write(*,*)'The prime factor(s) of the integer is given below:'
        do i=2,n
        r=mod(n,i)
        if (r.ne. 0.0)goto 10
        do j=2,i/2
        if(mod(i,j).eq.0)goto 10
        end do
        write(*,*)i
 10   end do
        end
        
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