C++ Articles - Page 681 of 719

The size of void pointer varies 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. Finding Size of a Void Pointer  To find the size of a void pointer, you can use the sizeof() operator that accepts a data type, variable name, or any value and returns its size. In this case, you need to pass the name of the void pointer. Syntax Following is the basic syntax of void ... Read More

In C++, both delete and free() are used to deallocate the dynamically created memory. In this article, we will learn about the delete operator and free() function with the help of examples. C++ delete Operator The delete operator is used to deallocate the memory. User has privilege to deallocate the created pointer variable by this delete operator. Syntax Here is the syntax of delete operator in C++ language: delete pointer_variable; Here is the syntax to delete the block of allocated memory: delete[ ] pointer_variable; Example Following is the example of delete operator to see its usage in memory ... Read More

The return value of main() function shows how the program exited. The normal exit of program is represented by zero return value. If the code has errors, fault etc., it will be terminated by non-zero value.In C++ language, the main() function can be left without return value. By default, it will return zero.Here is the syntax of main() function in C language, int main() {    ….    return 0; }Here is an example of main() function in C language, Example Live Demo#include int main() {    int a = 10;    char b = 'S';    float c = ... Read More

There are so many C++ code formatter or beautifier tools which beautifies your code or format with proper indentation. The C++ code formatter/ beautifier are listed as follows − C++ Code Formatter/Beautifier Description Astyle This is a source code formatter. It can be used for C++, java and other languages. It’s latest version is 2.03 and it released in April 2013. Clang-Format It is a command line tool along with clang compiler. It is open- source tool and programmed in C++, python. The latest version is 3.3. Universal Indent GUI It ... Read More

The function modf() is used to split the passed argument in integer and fraction. It is declared in “math.h” header file for the mathematical calculations. It returns the fractional value of passed argument.Here is the syntax of modf() in C language, double modf(double value, double *integral_pointer);Here, value − The value which splits into integer and fraction.integral_pointer − It points the integer part of argument after splitting.Here is an example of modf() in C language, Example Live Demo#include #include int main () {    double val, x, res;    val = 28.856;    res = modf(val, &x);    printf("Integral part of val ... Read More

The function isgreater() is used to check that the first argument is greater than the second one or not. It is declared in “math.h” header file in C language. It returns true, if successful, otherwise false.Here is the syntax of isgreater().bool isgreater(value1 , value2);Here, value1 − This is the first argument which will be checked with value2.value2 − This is the second argument which is used to check value1 that is greater or not.Here is an example of isgreater().Example Live Demo#include #include using namespace std; int main() {    int val1 = 28;    int val2 = 8;    bool result; ... Read More

Increment operators are used to increase the value by one while decrement works opposite. Decrement operator decrease the value by one.Pre-increment (++i) − Before assigning the value to a variable, the value is incremented by one.Post-increment (i++) − After assigning the value to a variable, the value is incremented.Here is the syntax of i++ and ++i in C++ language,++variable_name; // Pre-increment variable_name++; // Post-incrementHere,variable_name −Name of the variable given by user.Here is an example of pre and post increment in C++ language,Example Live Demo#include using namespace std; int main() {    int i = 5;    cout

C++17 is the latest version of standard C++ language. C++11 and C++14 are the previous versions of C++. The current version makes several additions to the core language while some previous features are also removed. C++17 is known as feature full or feature complete. There are some of the new changes introduced in C++17 − Library changes - utils This is one of the most amazing feature of C++17. It merges the features and patterns of other libraries. Many of the sub-libraries are merged together into standards. The following features are added to utils library in C++17 − std::variant ... Read More

Both strncmp() and strcmp() are used in C/C++ programs for lexicographical string comparison. The strcmp() compares two strings till the null character is found, whereas strncmp() only compares a specified number of characters. What is strncmp() ? The function strncmp() is used to compare left string to right string up to a number. It works same as strcmp(). It returns a value greater than zero when the matching character of left string has greater ASCII value than the character of the right string. Returns a value less than zero when the matching character of left string has lesser ASCII value ... Read More

In C++, a single character is represented using a single quotation (' ') while a string is represented using a double quotation (" "). To change the single character into a string, use approaches like string_constructor, push_back(), etc., that solve the conversion. Example Input: ch = 'A' Output: str = A // "A" So, character A is converted to a string. C++ provides various approaches to convert single character into string as follows: Using string constructor Using push_back() Using stringstream ... Read More