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※ NOTES AND WARNINGS:

Forgetting to end a line in a semicolon

Forgetting to end a line in a semicolon will result in a compiler error. The error text may be obvious, and refer to a missing semicolon, or it may not. If an impenetrable or seemingly illogical compiler error comes up, one of the first things to check is a missing semicolon, in the immediate vicinity, preceding the line at which the compiler complained.

#define and #include

The semicolon MUST NOT places after #define and #include

if/else statement and for/while loop

If a semicolon is placed right after an if statement, else statement, for loop, or while loop, the semicolon is equivalent to a empty {} (curly braces). It means code inside these statements/loops become outside of the statements/loops. Let see two examples of without and with semicolon.

• Without semicolon

• With semicolon

As we can see, with semicolon the code inside if statement is executed although the condition of the statement is false.

In more detail, the code with semicolon:

is equivalent to: