How can a global variable be assigned to a local variable with the same name in declaration in C++?

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In C++, the scope of a local variable is limited to the block in which it was declared, while the scope of a global variable is the entire program. To assign the global variable to a local variable with the same name, you can use the scope resolution operator (::) to differentiate between the two variables:

int x = 5; // global variable

int main() {
  int x = 10; // local variable

  // Assign global variable to local variable with same name
  x = ::x;

  // Now x will have the value 5
  cout << x << endl;

  return 0;
}

Note that this may lead to confusion and errors in your program, as it can make it difficult to track the values of variables. It is generally a good practice to avoid using the same name for global and local variables.