foo.cc: In function ‘int main()’:
foo.cc:13:14: warning: ‘l’ may be used uninitialized [-Wmaybe-uninitialized]
   13 |         c=pow(10,l-1);
      |           ~~~^~~~~~~~
foo.cc:5:23: note: ‘l’ was declared here
    5 |         int a,b,c,d,e,l,k;
      |                       ^