mirror of https://github.com/saitohirga/WSJT-X.git
55 lines
1.2 KiB
Fortran
55 lines
1.2 KiB
Fortran
program t1
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real x(13)
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real(KIND=16) :: dlong,dlong0
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character wd*13,w*13,error*5
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character c*44 !NB: 44^13 = 2^(70.973)
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data c/' 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-./?@$'/
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nargs=iargc()
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if(nargs.ne.1) then
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print*,'Usage: t1 "FreeText13"'
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print*,' t1 <iters>'
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go to 999
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endif
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call getarg(1,w)
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iters=1
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read(w,*,err=10) iters
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10 continue
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do iter=1,iters
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if(iters.gt.1) then
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! Create a random free-text word
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call random_number(x)
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do i=1,13
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j=44*x(i) + 1
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w(i:i)=c(j:j)
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enddo
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endif
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! Encode a 13-character free-text message into a 71-bit integer.
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dlong=0.d0
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do i=1,13
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n=index(c,w(i:i))-1
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dlong=44.d0*dlong + n
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enddo
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dlong0=dlong
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! Decode a a 71-bit integer into a 13-character free-text message.
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do i=13,1,-1
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j=mod(dlong,44.d0)+1.d0
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wd(i:i)=c(j:j)
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dlong=dlong/44.d0
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enddo
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error=' '
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if(wd.ne.w) then
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error='ERROR'
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write(*,1010) w,dlong0,wd,error
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1010 format('"',a13,'"',f25.1,2x,'"',a13'"',2x,a5)
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endif
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if(mod(iter,1000).eq.0) print*,iter
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enddo
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999 end program t1
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