foo.cc: In function 'int main()':
foo.cc:6:20: warning: self-comparison always evaluates to true [-Wtautological-compare]
    6 |         if(a%100%10==a%100%10&&a%1000%100/10==a%1000%100/10)
      |            ~~~~~~~~^~~~~~~~~~
foo.cc:6:45: warning: self-comparison always evaluates to true [-Wtautological-compare]
    6 |         if(a%100%10==a%100%10&&a%1000%100/10==a%1000%100/10)
      |                                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~

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