View Compilation Error

0_0_13089897_6473.c: In function 'main':
0_0_13089897_6473.c:9:33: error: 'EOF' undeclared (first use in this function)
     while(scanf("%d %d",&M,&N)!=EOF)
                                 ^
0_0_13089897_6473.c:9:33: note: each undeclared identifier is reported only once for each function it appears in