關鍵字是在C 庫中預先定義或保留的單字，具有固定的含義，並用於執行內部操作。 C 語言支援超過64個關鍵字。
每個關鍵字都以小寫字母形式存在，如auto、break、case、const、continue、int等。
C 語言中的32個關鍵字也可在C語言中使用。
| auto | double | int | struct |
| break | else | long | switch |
| #case | enum | register | typedef |
| char | extern | return | union |
| const | float | short | unsigned |
| continue | ##for#signed | void | |
| #goto | sizeof | volatile | |
| if | static | while |
這是C 中新增的30個保留字，不在C語言中。
| dynamic_cast | namespace | reinterpret_cast | |
| explicit | new | static_cast | |
| #false | operator | template | |
| #friend | private | ##this | |
| inline | public | #throw | |
| #mutable | protected | true | |
| typeid | ##typenameusing | using | |
| wchar_t |
Input: str=”for” Output: for is a keyword
#include <stdio.h>
#include <string.h>
int main() {
char keyword[32][10]={
"auto","double","int","struct","break","else","long",
"switch","case","enum","register","typedef","char",
"extern","return","union","const","float","short",
"unsigned","continue","for","signed","void","default",
"goto","sizeof","voltile","do","if","static","while"
} ;
char str[]="which";
int flag=0,i;
for(i = 0; i < 32; i++) {
if(strcmp(str,keyword[i])==0) {
flag=1;
}
}
if(flag==1)
printf("%s is a keyword",str);
else
printf("%s is not a keyword",str);
}which is a keyword
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