foo.cc: In function 'int main()':
foo.cc:70:35: error: expected ';' before 'for'
   70 |  BigInt x1; x1.n=1;  x1.num[0]=1;1
      |                                   ^
      |                                   ;
   71 |  for(int i=1; i<=100; i++)
      |  ~~~                               
foo.cc:70:34: warning: statement has no effect [-Wunused-value]
   70 |  BigInt x1; x1.n=1;  x1.num[0]=1;1
      |                                  ^
foo.cc:71:15: error: 'i' was not declared in this scope
   71 |  for(int i=1; i<=100; i++)
      |               ^

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