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In a passage of text, individual words and punctuation marks are called tokens. Similarly, in a C program the smallest individual units are also known as C tokens. C has six types of tokens: 1. Identifiers e.g. x area __ temperature PI 2. Keywords e.g. int float for while 3. Constants e.g. -15.5 100 4. Strings e.g. “ABC” “year” 5. Operators e.g. + - * 6. Special Symbols e.g. ( ) [ ] { }