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	joko	1.6	/* $Id: prime.c,v 1.5 2006/05/12 20:38:15 joko Exp $ */
2	joko	1.5
3	joko	1.1	#include <stdio.h>
4	joko	1.6	#include <stdlib.h>
5			#include <limits.h>
6	joko	1.3
7	joko	1.6	#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	joko	1.5	#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
13	joko	1.4
14	joko	1.5	/* check for prime number */
15	joko	1.6	BOOL is_prime(long int number)
16	joko	1.1	{
17	joko	1.4	int i;
18			for (i=2; i*i <= number; i++) {
19			if ((number % i) == 0)
20	joko	1.6	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	joko	1.4	}
31	joko	1.1	}
32	joko	1.3
33	joko	1.1	int main(int argc, char * argv[])
34			{
35	joko	1.4
36			if (argc == 1) {
37	joko	1.6	PRINTERROR("No arguments given.");
38	joko	1.5	return -1;
39	joko	1.4	}
40
41	joko	1.5	/* (3) range mode */
42	joko	1.4	if (argc > 2) {
43			int i, j;
44			j = atoi(argv[2]);
45			for (i = atoi(argv[1]); i< j; i++) {
46	joko	1.1	PRINTPRIME(i);
47			}
48	joko	1.4
49	joko	1.5	/* other modes */
50	joko	1.4	} else {
51
52	joko	1.5	/* try to open file for reading */
53	joko	1.4	FILE * fp = fopen(argv[1], "r");
54
55	joko	1.5	/* (1) test-single-number mode: first argument is not a filename */
56	joko	1.4	if (fp == NULL) {
57	joko	1.6	/* PRINTPRIME(atoi(argv[1])); */
58			PRINTPRIME(convert_number(argv[1]));
59	joko	1.4
60	joko	1.5	/* (2) file mode: read numbers from file */
61	joko	1.4	} else {
62			char num[11];
63	joko	1.5	while (fgets(num, 11, fp)) {
64			printf("raw: %s\n", num);
65			printf("num: %i\n", atoi(num));
66	joko	1.1	PRINTPRIME(atoi(num));
67	joko	1.5	}
68	joko	1.1	fclose(fp);
69			}
70			}
71			}
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