C Language – Keywords
- Also known as reserved words or in-built words (Pre-defined words in Compiler)
- Keywords having a fixed meaning, these meanings cannot be changed.
- Keywords are used to construct for program statements.
- There are 32 keywords used in C Language.
- All keywords must be written in lowercase letters.
- Keyword just like a command, have a fixed syntax, and rule regulation and it is a part of C-tokens.
Example:
int, float, double, char, void, signed, unsigned, short, long, auto, register, extern, static, enum, typedef, if,
else, for, while, do, continue, struct, union, goto, switch, case, break, default, sizeof, const, return, volatile (Total-32)
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C-Language (Keywords and their purpose)
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Purpose/Objects (Keywords used for)
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Keywords used
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Primary data type –
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int, char, float, double, void
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Modify size (extend/reduce) of primary data type (these keyword are called modifier keywords) –
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short, long
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Qualifier (signed (+ve and –ve) and unsigned (without signed)) –
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signed, unsigned
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User-defined data type –
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typedef, enum |
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Derived data type –
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struct, union |
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Storage Classes –
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auto, extern, static, register |
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Conditional statement and selection/branching statements –
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if, else switch – break, – default – case |
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Looping/Iteration keywords –
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for, while, do |
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Jumping keywords –
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goto, break, continue, return |
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Keywords used for constant declaration –
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const |
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Keyword used for special operator –
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sizeof |
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Other (qualifier) – |
volatile |
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