[C]印出2~1000所有質數

#include <iostream.h> #include <string.h> #include <stdlib.h> int main(){     int a[1000];     for(int i=2;i<=1000;i++) a[i]=1;     for(int i=2;i<=1000;i++){         if(a[i]){             cout << i << ",";             for(int k=i;k<=1000;k+=i) a[k]=0;             }         } //-----------------------     printf("\n");     system("PAUSE");     return EXIT_SUCCESS; }