/in/foo.cc: In function 'int main()':
/in/foo.cc:121:26: error: no matching function for call to 'BigInt(const char*)'
  121 |     BigInt x(xStr.c_str());
      |                          ^
/in/foo.cc:56:5: note: candidate: 'BigInt::BigInt(const BigInt&)' (near match)
   56 |     BigInt(const BigInt &obj) { Copy(obj); }
      |     ^~~~~~
/in/foo.cc:56:5: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:121:24: error: conversion from 'const char*' to 'const BigInt' is ambiguous
  121 |     BigInt x(xStr.c_str());
      |              ~~~~~~~~~~^~
/in/foo.cc:47:5: note: candidate: 'BigInt::BigInt(char*)' (near match)
   47 |     BigInt(char s[])
      |     ^~~~~~
/in/foo.cc:47:5: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:121:24: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]
  121 |     BigInt x(xStr.c_str());
      |              ~~~~~~~~~~^~
      |                        |
      |                        const char*
/in/foo.cc:29:5: note: candidate: 'BigInt::BigInt(int)' (near match)
   29 |     BigInt(int x = 0)
      |     ^~~~~~
/in/foo.cc:29:5: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:121:24: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
  121 |     BigInt x(xStr.c_str());
      |              ~~~~~~~~~~^~
      |                        |
      |                        const char*
/in/foo.cc:47:5: note: candidate: 'BigInt::BigInt(char*)' (near match)
   47 |     BigInt(char s[])
      |     ^~~~~~
/in/foo.cc:47:5: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:121:24: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]
  121 |     BigInt x(xStr.c_str());
      |              ~~~~~~~~~~^~
      |                        |
      |                        const char*
/in/foo.cc:29:5: note: candidate: 'BigInt::BigInt(int)' (near match)
   29 |     BigInt(int x = 0)
      |     ^~~~~~
/in/foo.cc:29:5: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:121:24: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
  121 |     BigInt x(xStr.c_str());
      |              ~~~~~~~~~~^~
      |                        |
      |                        const char*