/in/foo.c: In function 'main':
/in/foo.c:4:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'b'
  int a b c;
        ^
/in/foo.c:4:8: error: unknown type name 'b'
/in/foo.c:5:16: error: 'a' undeclared (first use in this function)
  scanf("%d%d",&a,&b);
                ^
/in/foo.c:5:16: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:5:19: error: 'b' undeclared (first use in this function)
  scanf("%d%d",&a,&b);
                   ^