Command-Line Arguments
Often a program is developed that requires the user to enter a small amount of information at the terminal. This information might consist of a number indicating the triangular number you want to have calculated or a word you want to have looked up in a dictionary.
Instead of having the program request this type of information from the user, you can supply the information to the program at the time the program is executed. Command-line arguments provide this capability.
We have pointed out that the only distinguishing quality of the function main is that its name is special; it specifies where program execution is to begin. In fact, the runtime system actually calls upon the function main at the start of program execution, ...
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