63 lines
1,023 B
Plaintext
63 lines
1,023 B
Plaintext
-- decin/decout - Decimal i/o
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proc decin(chan in, var d, c)=
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-- Reads a decimal number from input into d. c is used as the first input
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-- character, and it contains the character just after the decimal number
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-- when decin exits.
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var neg:
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seq
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while (c='*s') or (c='*t') or (c='*n')
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in ? c
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if
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(c='-') or (c='+')
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seq
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neg:=(c='-')
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in ? c
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true
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neg:=false
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d:=0
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while ('0'<=c) and (c<='9')
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seq
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d:=(d*10)+(c-'0')
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in ? c
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if
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neg
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d:= -d
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:
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proc decout(chan out, value d, w)=
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-- Sends d to channel out in decimal on a field of w spaces. It is just like
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-- fprintf(out, "%*d", w, d);
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var dec[BYTE 12], di, dd, d0, neg:
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seq
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di:=0
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if
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d<0
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seq
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neg:=true
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dd:= -d
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d>=0
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seq
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neg:=false
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dd:=d
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d0:=1
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while d0<>0
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seq
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dec[BYTE di]:=(dd\10)+'0'
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di:=di+1
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dd:=dd/10
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d0:=dd
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if
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neg
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seq
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dec[BYTE di]:='-'
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di:=di+1
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seq i=[0 for w-di]
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out ! '*s'
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while di<>0
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seq
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di:=di-1
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out ! dec[BYTE di]
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:
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