92 lines
2.1 KiB
Text
92 lines
2.1 KiB
Text
.sp 1.5i
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.ft B
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Appendix C: An example
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.ft R
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.nh
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.nf
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\h'+10u' 1 \fBprogram\fR factorials(input, output);
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\h'+10u' 2 { This program prints factorials }
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\h'+10u' 3
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\h'+10u' 4 \fBconst\fR
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\h'+10u' 5 FAC1 = 1;
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\h'+10u' 6 \fBvar\fR
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\h'+10u' 7 i : integer;
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\h'+10u' 8
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\h'+10u' 9 \fBfunction\fR factorial(n : integer) : integer;
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10 \fBbegin\fR
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11 \fBif\fR n = FAC1 \fBthen\fR
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12 factorial := FAC1
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13 \fBelse\fR
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14 factorial := n * factorial(n-1);
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15 \fBend\fR;
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16
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17 \fBbegin\fR
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18 write('Give a number : ');
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19 readln(i);
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20 \fBif\fR i < 1 \fBthen\fR
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21 writeln('No factorial')
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22 \fBelse\fR
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23 writeln(factorial(i):1);
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24 \fBend\fR.
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.bp
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.po
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.DS
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mes 2,4,4 loc 16
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\&.1 cal $_wrs
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rom 'factorials.p\(rs000' asp 12
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i lin 19
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bss 4,0,0 lae input
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output cal $_rdi
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bss 540,0,0 asp 4
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input lfr 4
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bss 540,0,0 ste i
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exp $factorial lae input
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pro $factorial, ? cal $_rln
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mes 9,4 asp 4
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lin 11 lin 20
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lol 0 loe i
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loc 1 loc 1
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cmi 4 cmi 4
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teq tlt
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zeq *1 zeq *1
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lin 12 lin 21
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loc 1 .4
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stl -4 rom 'No factorial'
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bra *2 lae output
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1 lae .4
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lin 14 loc 12
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lol 0 cal $_wrs
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lol 0 asp 12
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loc 1 lae output
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sbi 4 cal $_wln
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cal $factorial asp 4
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asp 4 bra *2
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lfr 4 1
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mli 4 lin 23
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stl -4 lae output
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2 loe i
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lin 15 cal $factorial
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mes 3,0,4,0,0 asp 4
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lol -4 lfr 4
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ret 4 loc 1
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end 4 cal $_wsi
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exp $m_a_i_n asp 12
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pro $m_a_i_n, ? lae output
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mes 9,0 cal $_wln
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fil .1 asp 4
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\&.2 2
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con input, output lin 24
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lxl 0 loc 0
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lae .2 cal $_hlt
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loc 2 end 0
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lxa 0 mes 4,24,'factorials.p\(rs000'
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cal $_ini
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asp 16
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lin 18
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\&.3
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rom 'Give a number : '
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lae output
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lae .3
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.DE
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