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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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