View Compilation Error

0_0_26836710_21662.c: In function 'main':
0_0_26836710_21662.c:4:33: error: 'EOF' undeclared (first use in this function)
     while(scanf("%d %d",&m,&n)!=EOF){
                                 ^
0_0_26836710_21662.c:4:33: note: each undeclared identifier is reported only once for each function it appears in