>>31
#include <stdio.h>

int main(void)
{
int a;
FILE *fp;
if ((fp=fopen("a.txt","r"))==NULL){
perror("error![file] ");
return -1;
}
while (fscanf(fp,"%d",&a) != EOF){
if ((a%2)==0){
printf("%d\n",a);
}
}
return 0;
}