/in/foo.cc: In function 'int main()':
/in/foo.cc:8:16: warning: 'n' is used uninitialized [-Wuninitialized]
    8 |         while(n>0){
      |               ~^~
/in/foo.cc:6:9: note: 'n' was declared here
    6 |     int n;
      |         ^