BSArch/01/prime.c

/* $Id: prime.c,v 1.5 2006/05/12 20:38:15 joko Exp $ */

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

#define BOOL int
#define TRUE 1
#define FALSE 0

#define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)

/* check for prime number */
BOOL is_prime(long int number)
{
        int i;
        for (i=2; i*i <= number; i++) {
                if ((number % i) == 0)
                        return FALSE;
        }
        return TRUE;
}

/* convert from string to long, with error checking */
long int convert_number(const char *nptr) {
        long int number = strtol(nptr, (char **)NULL, 10);
        if (number == LONG_MAX) {
                PRINTERROR("Number '%s' is not in range of 'long int'.");
        }
}

int main(int argc, char * argv[])
{
        
        if (argc == 1) {
                PRINTERROR("No arguments given.");
                return -1;
        }
        
        /* (3) range mode */
        if (argc > 2) {
                int i, j;
                j = atoi(argv[2]);
                for (i = atoi(argv[1]); i< j; i++) {
                        PRINTPRIME(i);
                }
        
        /* other modes */
        } else {

                /* try to open file for reading */
                FILE * fp = fopen(argv[1], "r");
                
                /* (1) test-single-number mode: first argument is not a filename */
                if (fp == NULL) {
                        /* PRINTPRIME(atoi(argv[1])); */
                        PRINTPRIME(convert_number(argv[1]));
                
                /* (2) file mode: read numbers from file */
                } else {
                        char num[11];
                        while (fgets(num, 11, fp)) {
                                printf("raw: %s\n", num);
                                printf("num: %i\n", atoi(num));
                                PRINTPRIME(atoi(num));
                        }
                        fclose(fp);
                }
        }
}
1	/* $Id: prime.c,v 1.5 2006/05/12 20:38:15 joko Exp $ */
2
3	#include <stdio.h>
4	#include <stdlib.h>
5	#include <limits.h>
6
7	#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)
13
14	/* check for prime number */
15	BOOL is_prime(long int number)
16	{
17	int i;
18	for (i=2; i*i <= number; i++) {
19	if ((number % i) == 0)
20	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	}
31	}
32
33	int main(int argc, char * argv[])
34	{
35
36	if (argc == 1) {
37	PRINTERROR("No arguments given.");
38	return -1;
39	}
40
41	/* (3) range mode */
42	if (argc > 2) {
43	int i, j;
44	j = atoi(argv[2]);
45	for (i = atoi(argv[1]); i< j; i++) {
46	PRINTPRIME(i);
47	}
48
49	/* other modes */
50	} else {
51
52	/* try to open file for reading */
53	FILE * fp = fopen(argv[1], "r");
54
55	/* (1) test-single-number mode: first argument is not a filename */
56	if (fp == NULL) {
57	/* PRINTPRIME(atoi(argv[1])); */
58	PRINTPRIME(convert_number(argv[1]));
59
60	/* (2) file mode: read numbers from file */
61	} else {
62	char num[11];
63	while (fgets(num, 11, fp)) {
64	printf("raw: %s\n", num);
65	printf("num: %i\n", atoi(num));
66	PRINTPRIME(atoi(num));
67	}
68	fclose(fp);
69	}
70	}
71	}
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