foo.cc: In function ‘int digit(long long int, long long int)’:
foo.cc:13:16: warning: ‘ret’ may be used uninitialized [-Wmaybe-uninitialized]
   13 |         return ret;
      |                ^~~
foo.cc:7:13: note: ‘ret’ was declared here
    7 |         int ret;
      |             ^~~
foo.cc: In function ‘int main()’:
foo.cc:18:24: warning: ‘ret’ may be used uninitialized [-Wmaybe-uninitialized]
   18 |         cout<<digit(n,k)<<endl;
      |                        ^
foo.cc:7:13: note: ‘ret’ was declared here
    7 |         int ret;
      |             ^~~

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