foo.cc: In function 'int main()':
foo.cc:6:15: warning: 'a' is used uninitialized [-Wuninitialized]
    6 |     if(a/7==0 and a/5==0){
      |        ~~~~~~~^~~~~~~~~~
foo.cc:5:9: note: 'a' was declared here
    5 |     int a;
      |         ^

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