Is a valid integer constant. In some programming languages, such as C++ and Java, when using integer variables, you can assign a floating point number to an integer variable. The compiler will automatically convert the floating point number to an integer type. 100.0 will be converted to the integer type 100. 100.0 It is a valid integer constant. In programming languages, such as Python, floating point numbers cannot be directly assigned to integer variables, and a forced type conversion function is required for conversion.