Undefined Behaviour

[udit043]

   #include "google/gtest/include/gtest/gtest.h"
   int main(int argc,char **argv)
   {
        int x=15;
        printf("%d %d %d %d",x=1,x<20,x*1,x>10);
        return 0;
   }
   Output is : 1 1 1 1 

There should be a warning , function argument evaluations are not sequenced relative to each other. Which means that modifying access to x in x=1 is not sequenced with relation to other accesses, like the one in x*1. The behavior is undefined.