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C Articles
Page 90 of 96
How to write long strings in Multi-lines C/C++?
To write long strings in multi-lines, you can use the 'newline character' or 'string concatenation'. It increases the readability of the code, makes the code look clean, and you can avoid horizontal scrolling. In this article, we have a long string and our task is to write the long string in multi-lines in C. Syntax // Using newline character char str[] = "First lineSecond lineThird line"; // Using string concatenation char str[] = "First part of string " "Second part of string ...
Read MoreData Types we cannot use to create array in C
In C programming, arrays can be created using most data types like int, char, float, double, etc. However, there are certain data types that cannot be used to create arrays. The most notable restriction is with the void data type. Syntax datatype array_name[size]; // Valid for most data types void array_name[size]; // Invalid - compilation error Data Types That Cannot Be Used for Arrays 1. Void Data Type The void data type represents "no type" and has no size. Since arrays need to know the size of ...
Read MoreDifference between PHP and C
PHP and C are two distinct programming languages that serve different purposes. PHP is a server−side scripting language primarily used for web development, while C is a low−level procedural programming language used for system programming. Understanding their differences helps developers choose the right tool for their projects. What is PHP? PHP (Hypertext Preprocessor) is a general−purpose programming language developed by Rasmus Lerdorf in 1994. It is primarily utilized for web development and runs on web servers to generate dynamic content. PHP code is processed by a PHP interpreter installed on web servers as a module, daemon, ...
Read MoreHow to pass a 2D array as a parameter in C?
In C programming, a 2D array can be passed as a parameter to a function in several ways. The method depends on whether the array dimensions are known at compile time or need to be determined at runtime. Syntax // Method 1: Fixed dimensions (known at compile time) void function_name(int arr[ROWS][COLS]); // Method 2: Variable dimensions (C99 and later) void function_name(int rows, int cols, int arr[rows][cols]); // Method 3: Using pointer to array void function_name(int (*arr)[COLS]); Method 1: Using Fixed Dimensions When array dimensions are known at compile time, you can specify ...
Read MoreWhen do function-level static variables get initialized in C/C++?
Static variables can be defined using the static keyword. They are variables that remain in memory while the program is running, meaning their lifetime is the entire program execution. This is different from automatic variables, which remain in memory only when their function is running and are destroyed when the function exits. Function-level static variables are initialized only once − the first time the function is called. The memory for them is allocated at program load time, but the initialization occurs during the first function execution. Syntax static data_type variable_name = initial_value; Example: Static ...
Read MoreWhy C/C++ variables doesn’t start with numbers
In C/C++, a variable name can have alphabets, numbers, and the underscore( _ ) character. There are some keywords in the C/C++ language. Apart from them, everything is treated as an identifier. Identifiers are the names of variables, constants, functions, etc. Syntax Valid identifier naming rules in C − // Valid identifier patterns: [a-zA-Z_][a-zA-Z0-9_]* // Valid examples: variable_name, _count, num1, my_var // Invalid examples: 1variable, 2name, 3_count Why Variables in C/C++ Can't Start with Numbers? In C and C++, variable names (also known as identifiers) cannot start with a digit due to ...
Read MoreDeclare variable as constant in C
In C programming, variables can be declared as constants using the const keyword or the #define preprocessor directive. Constants ensure that variable values cannot be modified after initialization, providing data integrity and preventing accidental changes. Syntax const datatype variable_name = value; #define CONSTANT_NAME value Method 1: Using const Keyword Variables can be declared as constants by using the const keyword before the datatype of the variable. The constant variables can be initialized once only. The default value of uninitialized constant variables is zero. #include int main() { ...
Read MoreInitialization of global and static variables in C
In C language both the global and static variables must be initialized with constant values. This is because the values of these variables must be known at compile time before the program execution starts. An error will be generated if the constant values are not provided for global and static variables. Syntax // Global variable initialization data_type variable_name = constant_value; // Static variable initialization static data_type variable_name = constant_value; Example 1: Valid Initialization with Constants This example demonstrates the correct way to initialize global and static variables using constant values − ...
Read MoreHow do I find the length of an array in C/C++?
To find the length of an array in C, we can use various approaches that are essential for array manipulation. Finding the length of an array is a fundamental task used in looping through arrays, sorting, searching, and memory management operations. In this article, we will explore different methods to determine the size of an array in C programming. Syntax // Method 1: Using sizeof operator int length = sizeof(array) / sizeof(array[0]); // Method 2: Using pointer arithmetic int length = *(&array + 1) - array; Method 1: Using sizeof() Operator The ...
Read MoreWhen to use references vs. pointers in C/C++
In C programming, we work with pointers to access memory addresses and manipulate data indirectly. C does not have reference variables like C++, but understanding the difference helps when transitioning between languages. Syntax // Pointer declaration and usage datatype *pointer_name; pointer_name = &variable_name; Pointers in C Pointers are variables that store memory addresses of other variables. They provide indirect access to data and enable dynamic memory allocation. Example: Basic Pointer Usage #include int main() { int a = 8; int *ptr; ...
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