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0
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1 #include "stdio.h"
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2
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3 int
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4 main(ac,av)
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5 int ac;
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6 char *av[];
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7 {
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8 int n;
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9 n = atoi(av[1]);
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10 goto factorial(n,1,n,print,return,environment);
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11 }
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12
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13 code print(n,result,orig,print,exit1,exit1env)
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14 int n,result,orig;
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15 code (*print)(),(*exit1)();
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16 void *exit1env;
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17 {
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18 printf("%d! = %d\n",n, result);
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19 goto (*exit1)(1),exit1env;
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20 }
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21
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22 code factorial(n,result,orig,print,exit1,exit1env)
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23 int n,result,orig;
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24 code (*print)();
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25 code (*exit1)();
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26 void *exit1env;
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27 {
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28 if (n<0) {
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29 printf("err %d!\n",n);
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30 goto (*exit1)(0),exit1env;
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31 }
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32 if (n==0)
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7
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33 goto (*print)(n,result,orig,print,exit1,exit1env);
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34 /* goto print(n,result,orig,print,exit1,exit1env); */
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0
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35 else {
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36 result *= n;
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37 n--;
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38 goto factorial(n,result,orig,print,exit1,exit1env);
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39 }
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40 }
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