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Articles by Tapas Kumar Ghosh
Page 12 of 19
What is the size of void pointer in C/C++ ?
The size of void pointer varies from system to system. If the system is 16-bit, size of void pointer is 2 bytes. If the system is 32-bit, size of void pointer is 4 bytes. If the system is 64-bit, size of void pointer is 8 bytes. This is because a pointer stores memory addresses, and the size depends on the system's addressing capability. Syntax To find the size of a void pointer, use the sizeof() operator: sizeof(void*) sizeof(pointer_variable) Example: Finding Size of Void Pointer The following example demonstrates how to find the size ...
Read MoreErrors in C/C++
In C/C++, an error occurs due to an invalid operation performed by the user. The error normally stops the program execution until it is fixed. So, the error should be removed before compilation and execution. Types of Error in C/C++ Following is the list of errors occur in C/C++ programming: Syntax Error Run-Time Error Linker Error Logical Error Semantic Error In this article, we will see the implementation of error in C/C++ programs. Syntax Error The syntax error ...
Read MoreC++ Program to Implement Sparse Array
What is Sparse Array?Sparse array is used to determines the dimension of an array in which most of the elements are zero. It can be used for matrix calculation. Characteristics of Sparse Array Following are list of points that defines the characteristics of a sparse array: Most of the elements are zero or null values which means it is unused. Only non-zero elements and their indexes are stored. It is used to save the memory while comparing to normal array calculation. Example The Sparse array of ...
Read MoreWhat are the rules for calling the superclass constructor C++?
In C++, a superclass serves as a base/parent class. When we create a derived class (or child class) from a superclass, sometimes we have to call the constructor of the base class along with the constructor of the derived class. Unlike Java, there is no reference variable for the superclass. If the constructor is non-parameterized, then it will be called automatically with the derived class, otherwise, we have to put the superclass constructor in the initializer list of the derived class. Constructor Without Arguments It is a default constructor where no argument is passed to it. Here, we create a ...
Read MoreWhat do you mean by a dynamic initialization of variables?
Dynamic initialization of object refers to initializing the objects at run time i.e., the initial value of an object is to be provided during runtime. Dynamic initialization can be achieved using constructors and passing parameters values to the constructors. This type of initialization is required to initialize the class variables during runtime. Why do we need the dynamic initialization? Dynamic initialization of objects is useful because It utilizes memory efficiently. Various initialization formats can be provided using overloaded constructors. It has the flexibility of using different formats ...
Read MoreRead integers from a text file with C++ ifstream
In C++, we can read the integer values from text files using the ifstream class that allows the user to perform input operations from the files. Here, we have filename (tp.txt) that used in the program and store some integers value. 21 61 24 05 50 11 12 21 66 55 Example to Read Integers from a Text File In this example, we created one text file to save the integers values and then access those value using file handling operation. #include #include using namespace std; int main() { // Define the maximum ...
Read MoreHow can I get a file\'s size in C++?
In C++, the file size determines the total number of bytes. To get the file size, we can take reference of the fstream header which contains various functions such as in_file(), seekg(), and tellg(). Example Input: The file name is tp.txt content- "Hello Tutorialspoint" Output: Size of the file is 22 bytes Example Input: The file name is testfile.txt content- "Hello Tutorialspoint" Output: File size is 27 bytes Now, we will demonstrate the C++ programs of the above two examples using file handling. Getting File Size in C++ The short form of fstream header is file stream which ...
Read MoreHow to use range-based for() loop with std::map?
In C++, a map is defined by an element storage container in the form of key-value pairs where each key is unique and mapped with a respective value. While range-based for loop is a very simple approach to iterate over elements in the container. In this article, we will learn the usage of range-based for loop over std::map in C++. Example Scenario Input: myMap: { {1, "Ravi"}, {2, "Tom"} } Output: 1: Ravi 2: Tom What is std::map? The std::map is an associative container that stores key-value pairs in sorted order. The maps are used for fast lookup, insertion, and deletion based on keys.Following is the basic ...
Read MoreWhat is the difference between iostream and iostream.h in C++?
Both and are the header files of C++ language. The .h extension was common in older, non-standard implementations like Turbo C++. The has been deprecated in modern C++ compilers and the became part of the C++ standard starting from the 1998 ANSI/ISO standard. The Header File The iostream.h header file was part of the early 1990s I/O streams library, developed at AT&T for use with early C++. At that time, C++ was not yet standardized. The purpose of this header file is used to perform the input-output operations. Example Following is an example of iostream.h as per ...
Read MoreHow to create timer using C++11?
The term "timer" is used to define the time based operations on hours, minutes, and seconds. Here, we can use the chrono library of C++ that helps to set the different timer operations like countdown, delayed, current time, etc. In this article, we will learn how to create a timer using C++. Timer Properties There are various properties to consider for building a timer in C++ program: Integer: int (milliseconds to wait until to run code). Boolean: bool (If this is true, it returns instantly, and run the code after specified ...
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