#include<stdio.h>
main()
{
    FILE *f1, *f2;
    int number, i;
    printf("Contents of Data file\n\n");
    f1 = fopen("DATA","w");
    for(i=1;i<=30;i++)
    {
        scanf("%d",&number);
    if(number=-1) break;
    putw(number,f1);
    }
    fclose(f1);
    f1 = fopen("DATA","r");
    f2 = fopen("EVEN","w");
while((number=getw(f1))!=EOF)
if(number%2==0)
        putw(number,f2);
fclose(f1);
fclose(f2);
f2 = fopen("EVEN","r");
printf("\n\nContents of EVEN file\n\n");
while((number=getw(f2))!=EOF)
  printf("%4d",number);
fclose(f2);
}

系统自建的文件，就在工程中

是，我疏忽了

就是这个错误，现在可以运行了，谢谢哈