Rules to Write a Program

Types of variables, constants & keywords the next logical step is to combine them to form instructions.

Rules to Write a Program

• Each instruction in a C program is written as a separate statement. Therefore a complete C program would comprise of a series of statements.
• The statements in a program must appear in the same order in which we wish them to be executed; unless of course the logic of the problem demands a deliberate ‘jump’ or transfer of control to a statement, which is out of sequence.
• Blank spaces may be inserted between two words to improve the readability of the statement. However, no blank spaces are allowed within a variable, constant or keyword.
• All statements are entered in small case letters.
• C has no specific rules for the position at which a statement is to be written. That’s why it is often called a free-form language.
• Every C statement must end with a ;. Thus ; acts as a statement terminator.