foo.cc: In function 'int main()':
foo.cc:89:15: warning: unused variable 'b' [-Wunused-variable]
   89 |         int a,b=0,c,d,i,j,k;
      |               ^
foo.cc:89:19: warning: unused variable 'c' [-Wunused-variable]
   89 |         int a,b=0,c,d,i,j,k;
      |                   ^
foo.cc:89:21: warning: unused variable 'd' [-Wunused-variable]
   89 |         int a,b=0,c,d,i,j,k;
      |                     ^
foo.cc:89:27: warning: unused variable 'k' [-Wunused-variable]
   89 |         int a,b=0,c,d,i,j,k;
      |                           ^
foo.cc:90:14: warning: unused variable 'w' [-Wunused-variable]
   90 |         char w[20]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
      |              ^

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