BSArch/01/prime.c

/* $Id$ */

#include <stdio.h>

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

/* check for prime number */
int is_prime(int number)
{
        int i;
        for (i=2; i*i <= number; i++) {
                if ((number % i) == 0)
                        return 0;
        }
        return 1;
}

int main(int argc, char * argv[])
{
        
        if (argc == 1) {
                PRINTERROR("No arguments given, will segfault under cygwin. :-)");
                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]));
                
                /* (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	1.5	/* $Id$ */
2
3	joko	1.1	#include <stdio.h>
4	joko	1.3
5	joko	1.4	#define PRINTPRIME(x) if(is_prime(x)) printf("%i\n", x)
6	joko	1.5	#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
7	joko	1.4
8	joko	1.5	/* check for prime number */
9	joko	1.4	int is_prime(int number)
10	joko	1.1	{
11	joko	1.4	int i;
12			for (i=2; i*i <= number; i++) {
13			if ((number % i) == 0)
14			return 0;
15			}
16			return 1;
17	joko	1.1	}
18	joko	1.3
19	joko	1.1	int main(int argc, char * argv[])
20			{
21	joko	1.4
22			if (argc == 1) {
23			PRINTERROR("No arguments given, will segfault under cygwin. :-)");
24	joko	1.5	return -1;
25	joko	1.4	}
26
27	joko	1.5	/* (3) range mode */
28	joko	1.4	if (argc > 2) {
29			int i, j;
30			j = atoi(argv[2]);
31			for (i = atoi(argv[1]); i< j; i++) {
32	joko	1.1	PRINTPRIME(i);
33			}
34	joko	1.4
35	joko	1.5	/* other modes */
36	joko	1.4	} else {
37
38	joko	1.5	/* try to open file for reading */
39	joko	1.4	FILE * fp = fopen(argv[1], "r");
40
41	joko	1.5	/* (1) test-single-number mode: first argument is not a filename */
42	joko	1.4	if (fp == NULL) {
43	joko	1.1	PRINTPRIME(atoi(argv[1]));
44	joko	1.4
45	joko	1.5	/* (2) file mode: read numbers from file */
46	joko	1.4	} else {
47			char num[11];
48	joko	1.5	while (fgets(num, 11, fp)) {
49			printf("raw: %s\n", num);
50			printf("num: %i\n", atoi(num));
51	joko	1.1	PRINTPRIME(atoi(num));
52	joko	1.5	}
53	joko	1.1	fclose(fp);
54			}
55			}
56			}
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