Question Discussion & Solution

🔑 Key Points

• In C++, an integer variable is declared using the int keyword, e.g., int count = 10;.
• A single-precision floating-point variable is declared using the float keyword.
• When initializing a float variable with a literal value, it's crucial to append the f or F suffix (e.g., 99.99f). Without the suffix, a decimal literal like 99.99 is treated as a double by default.
• Option A correctly uses int for the integer and float with the f suffix for the floating-point literal, ensuring proper type matching and avoiding potential narrowing conversion warnings.

📄 Additional Information

• C++ provides several fundamental data types, including int for integers, float for single-precision floating-point numbers, double for double-precision floating-point numbers, and char for characters.
• Implicit conversion from double to float (as in option C: float price = 99.99;) is a narrowing conversion, which might lead to loss of precision and can generate a compiler warning in some cases. Explicitly using the f suffix makes the code more robust and clear about the intended type of the literal.
• Variables must be declared before they are used, specifying their type and name.