foo.cc: In function 'int main()':
foo.cc:51:12: warning: unused variable 'x2' [-Wunused-variable]
   51 |  BigInt x1,x2,x3,x4,x5,a,b;
      |            ^~
foo.cc:51:18: warning: unused variable 'x4' [-Wunused-variable]
   51 |  BigInt x1,x2,x3,x4,x5,a,b;
      |                  ^~
foo.cc:51:21: warning: unused variable 'x5' [-Wunused-variable]
   51 |  BigInt x1,x2,x3,x4,x5,a,b;
      |                     ^~
foo.cc:51:26: warning: unused variable 'b' [-Wunused-variable]
   51 |  BigInt x1,x2,x3,x4,x5,a,b;
      |                          ^
foo.cc:52:9: warning: unused variable 'n2' [-Wunused-variable]
   52 |  int n1,n2;
      |         ^~

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