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Program to find the square root of a real number

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C      Program to find the square root of a real number
        real::a
        write(*,*)'Input the number:'
        read(*,*)a
        if (a.ge.0.0)then
        c=sqrt(a)
        write(*,10)c
10    Format(2x,'The square root of the number is',f16.4)
        else
        d=sqrt(-a)
        write(*,20)d
 20   Format(2x,'The square root of the number is i',f16.4)
        end if
        end
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