Type Casting Example

Changing the integer 9 to the floating-point number 9.0 (a double) is necessary to ensure that the division operation results in a floating-point division rather than an integer division. When you divide two integers, C++ performs integer division, which truncates the decimal part and results in an integer. By using 9.0, you ensure that the division is performed as a floating-point operation, giving you a more accurate result. This is important for calculations like converting Fahrenheit to Celsius, where precision is key.