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Assignment 8

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program assignment_8
real::s,t,x
integer::i,n
open(1,file='1st.txt',status='unknown')
open(2,file='2nd.txt',status='unknown')
open(3,file='3rd.txt',status='unknown')
open(4,file='4th.txt',status='unknown')
do n=1,4
  if(n==1)then
    x=-0.1
    1 x=x+0.1
    s=x
    write(n,*)x,s
    if(x<3.4)goto 1
  elseif(n==2)then
    x=-0.1
    2 x=x+0.1
    t=x
    s=x
    do i=1,(n-1)
    t=-t*x*x/(2*i*(2*i+1))
    s=s+t
    enddo
    write(n,*)x,s
    if(x<3.4)goto 2
   elseif(n==3)then
     x=-0.1
     3 x=x+0.1
     t=x
     s=x
     do i=1,(n-1)
     t=-t*x*x/(2*i*(2*i+1))
     s=s+t
     enddo
     write(n,*)x,s
     if(x<3.4)goto 3
   else
     x=-0.1
     4 x=x+0.1
     s=sin(x)
     write(n,*)x,s
     if(x<3.4)goto 4
   endif
   enddo
   end

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