2.2. Programming Languages¶
“Computer, scan the surface for lifeforms.”
“Hey Siri, what movies are playing nearby?”
Even though today’s tech makes it seem like computers understand spoken language, the devices do not use English, Chinese, Spanish, etc. to carry out their jobs. Instead, programmers must write their instructions in a form that computers understand.
Computers operate using binary code, which consists only of 0s and 1s. For
example, here is the binary version of the text
01001000 01100101 01101100 01101100 01101111 00100000 01010111 01101111
01110010 01101100 01100100
Each set of 8 digits represents one character in the text.
To make things a little easier, binary data may also be represented as
hexadecimal values. Here is
Hello World expressed in hex:
48 65 6c 6c 6f 20 57 6f 72 6c 64
To run an algorithm, all of the steps must be written in binary or hex so the computer can understand the instructions.
Fortunately, we do not need to worry about binary or hexadecimal code to make our programs work!
Writing code using only 0s and 1s would be impractical, so many clever individuals designed ways to convert between the text readable by humans and the binary or hexadecimal forms needed by machines.
These high-level languages can be written and understood by humans, and each one has its own characteristic vocabulary, style, and syntax.
188.8.131.52. How Computers Run Programs¶
Since computers only understand binary code, every programming language includes a compiler, which is a special tool that translates a programmer’s work into the 0s and 1s that the machines need.
If we want to print
Hello, World! on the screen, we would write the
instructions in our chosen programming language, then select “Run”. Our code
gets sent to the compiler, which converts our typed commands into something the
computer can use. The instructions are then executed by the machine, and we
observe the results.
In the example above, the syntax for printing
Hello, World! varies
2.2.2. How Many Programming Languages Are There?¶
Ask Google, “How many programming languages are there?” and many results get returned. Even with all these options, there is no specific answer to the question.
There are hundreds, if not thousands, of programming languages available. However, most are either obsolete, impractical, or too specialized to be widely used.
Arguments occur whenever someone makes a top 10 list for programming languages, but regardless of the opinions, one fact remains. Once you learn one language, learning the next is much, much easier. Adding a third becomes child’s play.
The reason for this is that thinking like a coder does not change with the
language. Your logic, reasoning, and problem solving skills apply just as well
screen in C# the command is
Console.WriteLine();, for Python, we use
console.log();. The syntax for each language
varies, but the results are identical.