This document provides an introduction to programming in C. It discusses that C was developed in 1972 by Dennis Ritchie and stands between problem-oriented and machine-oriented programming languages. It also outlines some of the basic elements of C like data types, variables, constants, and keywords. The document provides rules for constructing integer, real and character constants, and describes variables and the main function in C programs. It gives an example of a simple first C program to calculate simple interest.