View Compilation Error

0_0_17265853_11564.c: In function 'main':
0_0_17265853_11564.c:1:38: error: 'EOF' undeclared (first use in this function)
 main(a,b){while(scanf("%d%d",&a,&b)!=EOF)printf("%d\n",a+b);}
                                      ^
0_0_17265853_11564.c:1:38: note: each undeclared identifier is reported only once for each function it appears in