The do-while loop in C is a post-test loop: it executes the body first and checks the condition afterward. This guarantees the body runs at least once, regardless of the condition’s initial truth value. This is the key difference from the while loop, which checks the condition before the first iteration and may never execute …
C preprocessor directives are instructions that run before compilation. The preprocessor reads your source file, processes every line that starts with #, and hands the result to the compiler. Understanding them well means smaller code, safer constants, conditional compilation for different platforms, and header files that include safely more than once. Object-Like Macros — #define …
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 …