/[cvs]/joko/Uni/BSArch/01/prime.c
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Diff of /joko/Uni/BSArch/01/prime.c

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revision 1.5 by joko, Fri May 12 20:38:15 2006 UTC revision 1.6 by joko, Fri May 12 21:13:49 2006 UTC
# Line 1  Line 1 
1  /* $Id$ */  /* $Id$ */
2    
3  #include <stdio.h>  #include <stdio.h>
4    #include <stdlib.h>
5    #include <limits.h>
6    
7  #define PRINTPRIME(x) if(is_prime(x)) printf("%i\n", x)  #define BOOL int
8    #define TRUE 1
9    #define FALSE 0
10    
11    #define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
12  #define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)  #define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
13    
14  /* check for prime number */  /* check for prime number */
15  int is_prime(int number)  BOOL is_prime(long int number)
16  {  {
17          int i;          int i;
18          for (i=2; i*i <= number; i++) {          for (i=2; i*i <= number; i++) {
19                  if ((number % i) == 0)                  if ((number % i) == 0)
20                          return 0;                          return FALSE;
21            }
22            return TRUE;
23    }
24    
25    /* convert from string to long, with error checking */
26    long int convert_number(const char *nptr) {
27            long int number = strtol(nptr, (char **)NULL, 10);
28            if (number == LONG_MAX) {
29                    PRINTERROR("Number '%s' is not in range of 'long int'.");
30          }          }
         return 1;  
31  }  }
32    
33  int main(int argc, char * argv[])  int main(int argc, char * argv[])
34  {  {
35                    
36          if (argc == 1) {          if (argc == 1) {
37                  PRINTERROR("No arguments given, will segfault under cygwin. :-)");                  PRINTERROR("No arguments given.");
38                  return -1;                  return -1;
39          }          }
40                    
# Line 40  int main(int argc, char * argv[]) Line 54  int main(int argc, char * argv[])
54                                    
55                  /* (1) test-single-number mode: first argument is not a filename */                  /* (1) test-single-number mode: first argument is not a filename */
56                  if (fp == NULL) {                  if (fp == NULL) {
57                          PRINTPRIME(atoi(argv[1]));                          /* PRINTPRIME(atoi(argv[1])); */
58                            PRINTPRIME(convert_number(argv[1]));
59                                    
60                  /* (2) file mode: read numbers from file */                  /* (2) file mode: read numbers from file */
61                  } else {                  } else {
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