C++ Lesson 2: Variables

Overview of variables in C++.

This tutorial covers:
how declare a variable
the difference between data types
how to read in data from the console
how to print to the console

Category:

Science & Technology

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• int
• double
• string
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• python
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[jsne10]

is this differrent from creating ios apps?

[macheads101]

@jsne10 These tutorials are on how to create C++ programs. iOS applications are written in Objective-C, which is somewhat different than C++.

[DrumLifeForever]

my xcode says that "cout", "cin" and " endl" are undeclared and doesnt allows me to run the program.... what do i need to do?

[macheads101]

@DrumLifeForever did you remember to say "using namespace std;"

[DrumLifeForever]

@macheads101 yes and it wont recognize that either ;

it says : expected `=``` `-` `asm` ot `atribute`before `namespace`

[macheads101]

@DrumLifeForever If you send me the code in a personal message (i.e the entire main.cpp file), I can help you fix it.

[macheads101]

@DrumLifeForever did you include iostream?

[snowbloxia]

just wondering, but can you do python tutorials?

[MichaelKosir]

You explain things amazingly!! You're the best!

[nygiantsfan811]

this is a good tutorial but for the record "integer", "initial" and i forgot the other ones

[mattpdz]

Important note: you actually should include the string header in order to use std::string in the proper, standard-conformant way (i.e., so that it works on all the compilers that follow the C++ standard).

[mattpdz]

Keyword "double" stands for double-precision floating-point number (as opposed to a single-precision one, which is just called "float"). While the C++ standard doesn't specify how much is double-precision, your particular hardware (and, in general, the AMD/Intel-based platforms) follows the IEEE-754 standard, where double uses 64 bits, whereas single-precision "float" uses 32 bits. For more, see youtu.be/ClT4B7bpau4. A "decimal" is usually associated with fixed-point numbers, different thing.

[raadalba6al]

it's about the content buddy not the length. and we can pause anytime lol

thanks for the video :)