/in/foo.c: In function 'main':
/in/foo.c:6:17: error: invalid operands to binary & (have 'int *' and 'int')
  scanf("%d%d",&a&b);
               ~~^
/in/foo.c:9:16: error: 'B' undeclared (first use in this function)
  printf("%d",a%B);
                ^
/in/foo.c:9:16: note: each undeclared identifier is reported only once for each function it appears in