View Compilation Error

0_0_23321938_56.c: In function 'main':
0_0_23321938_56.c:4:27: error: 'EOF' undeclared (first use in this function)
     while(scanf("%d",&n)!=EOF)
                           ^
0_0_23321938_56.c:4:27: note: each undeclared identifier is reported only once for each function it appears in