View Compilation Error

0_0_30670133_30714.c: In function 'main':
0_0_30670133_30714.c:4:32: error: 'EOF' undeclared (first use in this function)
     while(scanf("%f%f",&n,&m)!=EOF&&n!=0&&m!=0)
                                ^
0_0_30670133_30714.c:4:32: note: each undeclared identifier is reported only once for each function it appears in