Demo on let's learn basic C programming

Explore how C uses alphabet, digits, and symbols as building blocks, then learn constants, variables, keywords, and instructions to form a complete program.

Explore the C character set, including alphabets, numbers, and punctuation like brackets and special symbols, and see how lowercase letters and digits form C characters.

Explore the combined form of constants and variables in C, distinguishing constants from variables, how memory locations store values, and how assignments update those values.

Explore the types of C constants, including integer, real, and character constants, and understand their primary and secondary categories.

Learn the rules for constructing real constants in C: one digit, a decimal point, a sign, and optional exponential form with e or E, with no comma or blank.

Learn rules for constructing character constants in C, including single-character constants and uppercase letters, and how variables hold integers, real variables, or character constants.

Learn how to construct valid C variable names by applying rules: first character is a letter or underscore, no commas, allowed characters, length limits, and meaningful identifiers.

Explore constructing integer constants in C, including rules: no decimal point, optional sign, no spaces or commas, and the compile-time range depends on the compiler.

Learn to write a basic C program that calculates the area and perimeter of a rectangle using length and breadth. Input is taken from the terminal via the vi editor.

Learn to write a simple interest program in C using vi on Ubuntu, employing scanf and printf, and compile with gcc to compute interest from P, T, and R.