Lexical Error

During the lexical analysis phase this type of error can be detected.

Lexical error is a sequence of characters that does not match the pattern of any token. Lexical phase error is found during the execution of the program.

Lexical phase error can be:

• Spelling error.
• Exceeding length of identifier or numeric constants.
• Appearance of illegal characters.
• To remove the character that should be present.
• To replace a character with an incorrect character.
• Transposition of two characters.

Example:

1. Void main()  
2. {  
3.      int x=10, y=20;  
4.      char * a;  
5.      a= &x;  
6.      x= 1xab;  
7. }  

In this code, 1xab is neither a number nor an identifier. So this code will show the lexical error.