freecodestuff

Command Line Arguments: File I/O Operations in C, Arguments passed to the main function from the command prompt are considered command-line arguments. signature of the main function is int main(int argc, char *argv[]) argument 1 in the main function will always hold a number of values passed which includes the executable name. argument 2 will …

Strings in C, Anything enclosed in double-quotes treated as a string. There is no predefined data type to declare and use strings. So, we use character arrays to declare strings in C programs. Every string terminates a special character called a NULL character. Declaring and Initializing Strings: the syntax for declaring a string is as …

Structures and Unions in C, A structure is a collection of one or more variables, possibly of different data types, grouped together under a single name to represent a single entity. Declaration: Initialization: struct Tag_name object = {init values} struct student var = {1, “sathi”, “ECE”, “ECE”}; Structure declarations will allow programmers to create new data …

Function Pointers in C, Function pointers can be useful when you want to create a callback mechanism and need to pass the address of a function to another function. They can also be useful when you want to store an array of functions, to call dynamically. Formally Syntax is type (*fun_pointer)(argument_type list); Example: float (*fp) (char , …

Arrays in C, It’s a kind of data structure that can store a fixed-size sequential collection of elements of the same type. It is used to store a collection of data, and a collection of variables of the same type. Formally syntax is Multidimensional Array Syntax: Arrays in C, Multidimensional Array syntax variable length arrays: variable-length …

Pointers in C, It is a variable that contains the address of a variable. Pointer Declaration:  pointer size is always equal to the word size of architecture. on 32-bit – 4 bytes 0n 64-bit – 8 bytes Pointers in C, It should initialize with the return value of the “&” operator or with NULL Pointer …

Functions in C, A function is a block of code that performs a specific task. There are two types of function in C programming: 1. Standard library functions: The standard library functions are built-in functions in C programming.         ex : printf, scanf, etc 2. User-defined functions: You can also create functions as per your need. Such functions created …

Control Statements in C If-Else: The if-else statement is used to express decisions. Formally the syntax is  If-Else Ladder: The if-else ladder statement is used to express multiple decisions. Formally the syntax is Switch: The switch statement is a multi-way decision that tests whether an expression matches one of a number of constant integer values, and …

Data Types in C, A data type is generally specified when declaring variables, arrays, functions, etc. In ANSI C, the data types are divided into three categories. They are: 1. Basic data types 2. User-defined data types 3. Derived data types Basic Data Types: There are few basic data types in C: Int: The int …

Operators in C Arithmetic Operators:   The binary arithmetic operators are +, -, *, /, and the modulus operator %. The % operator cannot be applied to a float or double. Relational Operators:  Relation operators check the relation between two operands. If the relation is true, it returns 1 or it returns 0. The relational operators are  >,  …