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Program to find the value of cosine of a given angle

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C      Program to find the value of cosine of a given angle
        Write(*,*)'Enter the value of the angle in degree:'
        read(*,*)x
        y=(acos(-1.0)*x)/180.0
        sum=0.0
        term=1.0
        i=0
        s=1.0
        dowhile(abs(term).ge.1.0E-6)
        term=(y**i/fact(i))*s
        sum=sum+term
        i=i+2
        s=-s
        end do
        write(*,10)sum
10    format(2x,'The value of cosx is',f16.4)
        end
        
C      Program sub function
        function fact(i)
        fact=1
        do j=1,i
        fact=fact*j
        end do
        return
        end
       
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