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Program to find the factorial of a non-negative integer

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C      Program to find the factorial of a non-negative integer
        write(*,*)'Enter a non-negative integer:'
        read(*,*)n
        write(*,*)'The factorial of',n,'is',fact(n)
        end
        
C      Program sub function
        function fact(n)
        fact=1
        do i=1,n
        fact=fact*i
        end do
        return
        end
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