The 'char' data type is most suitable for storing a single character in C++. It can hold characters like 'A', 'B', '1', '$', etc.

In C++, the bool data type is used to store boolean values, which can be either true or false. This data type is fundamental for representing conditions and making decisions in programs.

The main advantage of using inline functions is improved performance. By requesting the compiler to insert the function code directly at the calling point, you can reduce the overhead of function calls, leading to faster execution in certain situations. However, it's essential to use inline functions judiciously, as they can increase code size if used excessively.

Emily should use the XOR (^) operator to set a specific bit of an integer variable to 1. XOR toggles the bit's value without affecting other bits.

In C++, the == (equality) and != (inequality) operators have the same level of precedence. This means that expressions involving these operators are evaluated from left to right, and they have equal precedence when compared to each other.

The do-while loop in C++ is distinctive because it guarantees that the loop body will execute at least once. It first executes the loop body and then evaluates the condition. This behavior is useful when you want to ensure that a certain piece of code runs before checking the loop condition.

Robert should consider using the decimal data type in C#. Unlike float and double, which are floating-point types and have limited precision, decimal provides high precision and is suitable for financial calculations where accuracy is crucial. It can represent numbers with up to 28-29 significant digits, making it ideal for handling currency values.

In C++, the "->" operator is known as the member access operator and is used to fetch the value of the object or variable located at the address specified by its operand. It's commonly used to access members of objects pointed to by pointers. For example, if you have a pointer to a class instance, you can use "->" to access its members.

In C++, the default value of a function parameter can indeed be an expression. This expression can be any valid C++ expression, providing flexibility when setting default values. It's not limited to constant values and can include calculations or other expressions.

The main advantage of separating function declaration from its definition, especially in large projects, is Compilation Efficiency. By separating the declaration from the definition, you can create header files containing function declarations that can be included where needed. This reduces compilation time because changes to function implementations won't trigger recompilation of all files that include the header.