Arithmetic operators in C perform mathematical computations on integer and floating-point values. C provides addition (+), subtraction (-), multiplication (*), division (/), modulo (%), increment (++), and decrement (–). Understanding how integer division truncates and how pre- versus post-increment differ are among the most common sources of bugs for beginners. C Program for Arithmetic Operators …
An identifier in C is a name given to a variable, function, array, structure, or any other user-defined item. Identifiers follow strict rules in C: they must start with a letter or underscore, can contain letters, digits, and underscores, must not be a reserved keyword, and are case-sensitive. This last point — case sensitivity — …
Stack implementation in C uses an array with a top pointer that tracks the current topmost element. A stack is a LIFO (Last In, First Out) data structure — the last element pushed is the first one popped. It supports three core operations: PUSH (insert), POP (remove), and PEEK (view without removing). Stacks are used …
A linked list in C is a data structure where each element (called a node) stores a value and a pointer to the next node. Unlike an array, nodes are scattered in memory — the pointers chain them together into a sequence. This makes insertion and deletion at any position O(1) once you have a …
A union in C is similar to a structure, but all its members share the same memory location. While a struct allocates separate space for each member, a union allocates space equal to its largest member, and every member overlaps that same block of memory. Only one member holds a valid value at any point …
Given an M×N matrix, this program produces two independently sorted versions: Rows sorted ascending — within each row, elements are rearranged smallest to largest. Rows are independent of each other. Columns sorted descending — within each column, elements are rearranged largest to smallest (operating on the original matrix, not the row-sorted one). Columns are independent …