83 lines
1.3 KiB
C
83 lines
1.3 KiB
C
/*
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* This simple classical example of recursion is useful for
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* testing stack backtraces and such.
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*/
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#ifdef vxworks
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# include <stdio.h>
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/* VxWorks does not supply atoi. */
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static int
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atoi (z)
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char *z;
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{
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int i = 0;
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while (*z >= '0' && *z <= '9')
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i = i * 10 + (*z++ - '0');
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return i;
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}
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/* I don't know of any way to pass an array to VxWorks. This function
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can be called directly from gdb. */
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vxmain (arg)
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char *arg;
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{
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char *argv[2];
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argv[0] = "";
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argv[1] = arg;
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main (2, argv, (char **) 0);
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}
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#else /* ! vxworks */
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# include <stdio.h>
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# include <stdlib.h>
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#endif /* ! vxworks */
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#ifdef PROTOTYPES
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int factorial (int);
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int
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main (int argc, char **argv, char **envp)
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#else
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int
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main (argc, argv, envp)
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int argc;
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char *argv[], **envp;
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#endif
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{
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#ifdef usestubs
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set_debug_traps();
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breakpoint();
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#endif
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#ifdef FAKEARGV
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printf ("%d\n", factorial (1));
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#else
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if (argc != 2) {
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printf ("usage: factorial <number>\n");
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return 1;
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} else {
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printf ("%d\n", factorial (atoi (argv[1])));
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}
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#endif
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return 0;
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}
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#ifdef PROTOTYPES
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int factorial (int value)
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#else
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int factorial (value) int value;
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#endif
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{
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int local_var;
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if (value > 1) {
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value *= factorial (value - 1);
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}
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local_var = value;
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return (value);
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}
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