Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to program a gas mileage calculator in c [title] Understand what c + + is. [step] Headers can be seen as the " brain " of a program. The most common headers are " iostream " and " using namespace std.

Ending1: " [substeps] " using namespace std " is another header that makes programming easier. Without it, programmers must constantly type " std " after every function defined. Ending2: " at the top center of every calculator is a column, which tells you the volume of the data entered into the calculator and the value of the data. From the column you should see two numbers. Ending3: " [substeps] The first letter of a sentence is a colon, while the second letter is a comma. The first letter of any sentence is a hyphen. Ending4: " these are usually used to help you identify a vehicle that either has an apa or w2p rating. Last but not least, note that these should be identified using available data on vehicles each year.

Answer format: ending1/ending2/ending3/ending4