C++ variables can be assigned values without being declared.

The logical OR operator (||) returns false only if both operands are false.

 Logic errors are typically not caught by the compiler:

 A linker combines object program with other programs in the library to create executable code.

 Syntax rules: rules that specify which statements (instructions) are legal or valid

Write a C++ program to ask the user to input the electricity amount and calculate the total electricity bill by using the selection control structures according to the given condition: Round the numbers and keep only 2 decimal values, and use compound operators. From 0 to 10 electricity amount, multiply by 0.40 and display “The total electricity bill is =” From 11 to 20 electricity amount, multiply by 0.50 and display “The total electricity bill is =” From 21 to 30 electricity amount, multiply by 0.60 and display “The total electricity bill is =” Anything else display ” Invalid electricity data”

You can have multiple main() functions in a C++ program.

 Semantic rules: rules that specify which statements (instructions) are legal or valid

The C++ Standard Library’s iostream library is used exclusively for input operations

All variables must be initialized before they are used, and necessarily during declaration