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In C++, void means “no type”. It’s commonly used to declare functions that don’t return a value, functions that take no parameters

void greet() {

    std::cout << "Hello, World!" << std::endl;

}

Here, greet() performs an action but doesn’t return anything.

In C++, the statement return 0; is most commonly seen in the main() function.

Return value of main():

By convention, returning 0 from main() indicates that the program executed successfully.

Any non-zero value usually signals an error or abnormal termination.

If you omit return 0; in main(), modern C++ standards (C++11 and later) automatically assume return 0; at the end of main().

What \n Does

• It tells the program to move the cursor to the next line when printing text.
• Commonly used in std::cout statements to format output.

x += 3;   // equivalent to: x = x + 3;

In modern C++ (since C++11), the keyword auto tells the compiler to automatically deduce the type of a variable or function return value from its initializer or expression.

int i {};   // i is initialized to 0

Explanation

• This is uniform initialization (introduced in C++11).
• The curly braces {} tell the compiler to value-initialize the variable.
• For fundamental types like int, value-initialization sets it to zero.
• 
  
• while (std::cin >> score && score != -1)
• 
  
• && (Logical AND)
• 
  
• Both conditions must be true for the loop to continue;
• Input must succeed.
• The value must not be -1.

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