BSArch/01/prime.c

#include <stdio.h>
#define PRINTPRIME(x) if(prime(x)) printf("%i\n", x)

int 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[])
{
        int i, j;
        FILE * fp;
        char num[11];
        if(argc > 2 ){
                j=atoi(argv[2]);
                for(i=atoi(argv[1]) ; i< j; i++){
                        PRINTPRIME(i);
                }
        }else {
                fp=fopen(argv[1], "r");
                if(fp==NULL){
                        PRINTPRIME(atoi(argv[1]));
                }else{
                        while(fgets(num, 11, fp))
                                PRINTPRIME(atoi(num));
                        fclose(fp);
                }
        }
}
1	#include <stdio.h>
2	#define PRINTPRIME(x) if(prime(x)) printf("%i\n", x)
3
4	int prime(int number)
5	{
6	int i;
7	for(i=2;i*i<=number;i++){
8	if((number%i) == 0)
9	return 0;
10	}
11	return 1;
12	}
13
14	int main(int argc, char * argv[])
15	{
16	int i, j;
17	FILE * fp;
18	char num[11];
19	if(argc > 2 ){
20	j=atoi(argv[2]);
21	for(i=atoi(argv[1]) ; i< j; i++){
22	PRINTPRIME(i);
23	}
24	}else {
25	fp=fopen(argv[1], "r");
26	if(fp==NULL){
27	PRINTPRIME(atoi(argv[1]));
28	}else{
29	while(fgets(num, 11, fp))
30	PRINTPRIME(atoi(num));
31	fclose(fp);
32	}
33	}
34	}
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