Keywords in C

Keywords are predefined or reserved words that have special meanings to the compiler. These are part of the syntax and cannot be used as identifiers in the program. A list of keywords in C or reserved words in the C programming language are mentioned below:

We cannot use these keywords as identifiers (such as variable names, function names, or struct names). The compiler will throw an error if we try to do so.

Example:

#include <stdio.h>

int main() {
    int return = 10;   
    printf("%d\n", return);
    return 0;
}

Output

./Solution.c: In function 'main':
./Solution.c:4:9: error: expected identifier or '(' before 'return'
     int return = 10;   
         ^
./Solution.c:5:20: error: expected expression before 'return'
     printf("%d\n", return);
                    ^

Let's categorize all keywords based on context for a more clear understanding.

Difference Between Keywords and Identifiers