What does auto type specifier do in this line of code (since C++11)?

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auto x = 4000.22;

  • It specifies that the type of x will be deduced from the initializer – in this case, double.
  • It specifies that the type of x is automatic meaning that if can be assigned different types of data throughout the program.
  • It specifies that x is a variable with automatic storage duration.
  • It specifies that more memory will be allocated for x in case it needs more space, avoiding loss of data due to overflow.
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