/in/foo.c: In function 'main':
/in/foo.c:5:3: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  a,b>=-100;
   ^
/in/foo.c:5:3: warning: statement with no effect [-Wunused-value]
/in/foo.c:6:3: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  a,b<100;
   ^
/in/foo.c:6:3: warning: statement with no effect [-Wunused-value]
/in/foo.c:5:3: warning: 'b' is used uninitialized in this function [-Wuninitialized]
  a,b>=-100;
   ^