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==Keywords in C== | ==Keywords in C== | ||
| − | Keywords are reserved words in C, which a programmer must not use for other purposes. In C11 standard there are totally | + | Keywords are reserved words in C, which a programmer must not use for other purposes. In C11 standard there are totally 44 keywords which are as follows: |
{| {{table}} | {| {{table}} | ||
| − | | | + | | auto ||if||unsigned |
|- | |- | ||
| − | | break | + | | break||inline||void |
|- | |- | ||
| − | | case | + | | case||int||volatile |
|- | |- | ||
| − | | char | + | | char||long||while |
|- | |- | ||
| − | | const | + | | const||register||_Alignas |
|- | |- | ||
| − | | continue | + | | continue||restrict||_Alignof |
|- | |- | ||
| − | | default | + | | default||return||_Atomic |
|- | |- | ||
| − | | do | + | | do||short||_Bool |
|- | |- | ||
| − | | double | + | | double||signed||_Complex |
|- | |- | ||
| − | | else | + | | else||sizeof||_Generic |
|- | |- | ||
| − | | enum | + | | enum||static||_Imaginary |
|- | |- | ||
| − | | extern | + | | extern||struct||_Noreturn |
|- | |- | ||
| − | | float | + | | float||switch||_Static_assert |
|- | |- | ||
| − | | for | + | | for||typedef||_Thread_local |
|- | |- | ||
| − | | goto | + | | goto||union|| |
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| − | | union | ||
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|} | |} | ||
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| + | ==Language limits== | ||
| + | Any C compiler (conforming to C11 standard) should be able to handle the following cases: | ||
| − | + | * 127 nesting levels of blocks | |
| − | + | * 63 nesting levels of conditional inclusion | |
| + | <!-- 12 pointer, array, and function declarators (in any combinations) modifying an | ||
| + | arithmetic, structure, union, or void type in a declaration --> | ||
| + | * 63 nesting levels of parenthesized declarators within a full declarator | ||
| + | * 63 nesting levels of parenthesized expressions within a full expression | ||
| + | * 63 significant initial characters in an internal identifier or a macro name | ||
| + | * 31 significant initial characters in an external identifier | ||
| + | * 4095 external identifiers in one translation unit | ||
| + | * 511 identifiers with block scope declared in one block | ||
| + | * 4095 macro identifiers simultaneously defined in one preprocessing translation unit | ||
| + | * 127 parameters in one function definition | ||
| + | * 127 arguments in one function call | ||
| + | * 127 parameters in one macro definition | ||
| + | * 127 arguments in one macro invocation | ||
| + | * 4095 characters in a logical source line | ||
| + | * 4095 characters in a string literal (after concatenation) | ||
| + | * 65535 bytes in an object (in a hosted environment only) | ||
| + | * 15 nesting levels for #included files | ||
| + | * 1023 case labels for a switch statement (excluding those for any nested switch statements) | ||
| + | * 1023 members in a single structure or union | ||
| + | * 1023 enumeration constants in a single enumeration | ||
| + | * 63 levels of nested structure or union definitions in a single struct-declaration-list | ||
| + | {{Template:FBD}} | ||
Keywords are reserved words in C, which a programmer must not use for other purposes. In C11 standard there are totally 44 keywords which are as follows:
| auto | if | unsigned |
| break | inline | void |
| case | int | volatile |
| char | long | while |
| const | register | _Alignas |
| continue | restrict | _Alignof |
| default | return | _Atomic |
| do | short | _Bool |
| double | signed | _Complex |
| else | sizeof | _Generic |
| enum | static | _Imaginary |
| extern | struct | _Noreturn |
| float | switch | _Static_assert |
| for | typedef | _Thread_local |
| goto | union | |
Any C compiler (conforming to C11 standard) should be able to handle the following cases:
Keywords are reserved words in C, which a programmer must not use for other purposes. In C11 standard there are totally 42 keywords which are as follows:
| auto |
| break |
| case |
| char |
| const |
| continue |
| default |
| do |
| double |
| else |
| enum |
| extern |
| float |
| for |
| goto |
| if |
| inline |
| int |
| long |
| register |
| restrict |
| return |
| short |
| signed |
| sizeof |
| static |
| struct |
| switch |
| typedef |
| union |
| unsigned |
| void |
| volatile |
| while |
| _Alignas |
| _Alignof |
| _Atomic |
| _Bool |
| _Complex |
| _Generic |
| _Imaginary |
| _Noreturn |
| _Static_assert |
| _Thread_local |
GATECSE