A logical constant can have either of two values either true or false. In C a non-zero value is always treated as true whereas zero is treated as false.
The logical constants are very useful in evaluating logical expressions and complex condition.
A group of character enclosed within a pair of double inverted commas (" ") is treated as a string constant.
some example of string constant:
: "Hello"
"Welcome to eBiz"
"a"
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