ক্লাস 3: C Programs এর প্রয়োজনীয় উপকরন
CLASS 3: The Essentials of C Programs
In previous chapter you wrote some simple C programs. You also learned about the basic structure of a C program. You know that a program written in C has to be compiled before it can be executed. In this lesson you’ll learn more essentials within a C program, such as
- Constants and variables
- Expressions
- Statements
- Statement blocks
- C function types and names
- Arguments to functions
- The body of a function
- Function calls
The Basics of the C Program
As a building is made of bricks, a C program is made of basic elements, such as expressions, statements, statement blocks, and function blocks. These elements are discussed in the following sections. But first, you need to learn two smaller but important elements, constant and variable, which make up expressions.
Summary
In this Chapter you’ve learned the following:
- A constant in C is a value that never changes. A variable, on the other hand, can present different values.
- A combination of constants, variables, and operators is called an expression in the C language. An expression is used to denote different computations.
- The arithmetic operators include +, -, *, /, and %.
- A statement consists of a complete expression suffixed with a semicolon.
- The C compiler treats a statement block as a single statement, although the statement block may contain more than one statement.
- The function type of a function determines the type of the return value made by the function.
- You have to follow certain rules to make a valid function name.
- An argument contains information that you want to pass to a function. An argument list contains two or more arguments that are separated by commas.
- The opening brace ({) and closing brace (}) are used to mark the start and end of a C function.
- A function body contains variable declarations and statements. Usually, a function should accomplish just one task.
In the next lesson you’ll learn more about data types in the C language.
