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