foo.cc: In function 'int seg(point, point, point, point)':
foo.cc:29:9: warning: '*' in boolean context, suggest '&&' instead [-Wint-in-bool-context]
     if(s*t) return 0;
        ~^~
foo.cc:38:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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