View Compilation Error

0_0_35076016_22029.c: In function 'main':
0_0_35076016_22029.c:5:27: error: 'B' undeclared (first use in this function)
  while(scanf("%d\n%d",&A,&B)!=EOF)
                           ^
0_0_35076016_22029.c:5:27: note: each undeclared identifier is reported only once for each function it appears in