In todays C++ video we are working with C++ pointers! Have questions? Leave them below!
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Pointers are identical to a variable but stores the address of another variable. The pointer’s data type will be the same as the data type of the variable. The call by reference methodarguments to a function copies the address of an argument into the formal parameter. A variable stores the value and pointer stores the address of a variable. You can visually see the difference in the example given below. A compiler must do these three things for a variable:
A function is a self-contained block of statements that performs a coherent task of some kind. A function prototype is a declaration of a function that specifies the function’s name and type signature (arity, data types of parameters, and return type), but discards the function body.
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C and C++ are the most powerful programming language in the world. Most of the super fast and complex libraries and algorithms are written in C or C++. Most powerful Kernel programs are also written in C. So, there is no way to skip it.
In programming competitions, most programmers prefer to write code in C or C++. Tourist is considered the worlds top programming contestant of all ages who write code in C++.
During programming competitions, programmers prefer to use a lightweight editor to focus on coding and algorithm designing. Vim, Sublime Text, and Notepad++ are the most common editors for us. Apart from the competition, many software developers and professionals love to use Sublime Text just because of its flexibility.
I have discussed the steps we need to complete in this blog post before running a C/C++ code in Sublime Text. We will take the inputs from an input file and print outputs to an output file without using
freopen file related functions in C/C++.
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If you are familiar with C/C++then you must have come across some unusual things and if you haven’t, then you are about to. The below codes are checked twice before adding, so feel free to share this article with your friends. The following displays some of the issues:
The below code generates no error since a print function can take any number of inputs but creates a mismatch with the variables. The print function is used to display characters, strings, integers, float, octal, and hexadecimal values onto the output screen. The format specifier is used to display the value of a variable.
A signed integer is a 32-bit datum that encodes an integer in the range [-2147483648 to 2147483647]. An unsigned integer is a 32-bit datum that encodes a non-negative integer in the range [0 to 4294967295]. The signed integer is represented in twos-complement notation. In the below code the signed integer will be converted to the maximum unsigned integer then compared with the unsigned integer.
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C++ pointer is a variable whose value is the address of another variable. Pointers are a symbolic representation of addresses. They enable programs to simulate call-by-reference as well as to create and manipulate dynamic data structures. You must declare the pointer before you can work with it.
When declaring a variable by an identifier (or name), the variable is synonymous with its value.
int number = 3; std::cout << "number is initialized with a value of " << number << "\n"; // Outputs: number is initialized with a value of 3
The value of a variable can be modified directly.
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Inside a function, you can initialize a static variable using the static keyword.
I said “inside a function”, because global variables are static by default, so there’s no need to add the keyword.
What’s a static variable? A static variable is initialized to 0 if no initial value is specified, and it retains the value across function calls.
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