foo.cc: In function 'int main()':
foo.cc:5:7: warning: left operand of comma operator has no effect [-Wunused-value]
 -10000<a,b,c<10000;
 ~~~~~~^~
foo.cc:5:14: warning: right operand of comma operator has no effect [-Wunused-value]
 -10000<a,b,c<10000;
              ^~~~~
foo.cc:5:13: warning: right operand of comma operator has no effect [-Wunused-value]
 -10000<a,b,c<10000;
            ~^~~~~~

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