C-language has some reserve words which can not be used as variables or identifiers. These reserve words are keywords of C-language. These are the part of the C-Tokens.
There are mainly 40 keywords among which 32 are used by many C-compilers(also called Standard Keywords) for high level programming, whereas remaining 8 reserve words(also called Optional Keywords) are used by the programmer for the low lever programming.
These standard keywords are :| auto | extern | size of |
| break | float | static |
| case | foe | struct |
| char | goto | switch |
| constant | if | typedef |
| continue | int | union |
| default | long | unsigned |
| do | register | void |
| double | return | volatile |
| else | short | while |
| enum | signed | |
| Also some compiler have Advanced Optional Keywords as below: | ||
| ada | far | near |
| asm | fortran | pascal |
| entry | huge | |
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