There are some reserved words in C language whose meaning is
predefined in C compiler. We cannot use a keyword as a variable name. Keywords
can be for specific purpose. Assigning a new meaning for keyword is not
allowed. Mixing up variable names with keywords will create compilation error.
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32 keywords are used in C. The following figure gives you a
ready reference for C keywords. These keywords are all lowercase. Since upper case
and lowercase characters are not considered same in C, we can use an uppercase
keyword as an identifier. But it is not considered as good programming practice.
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