The CDC's recommendation that doctors give every pregnant woman a Tdap vaccination during every pregnancy â regardless of whether a woman has already received one dose of Tdap â is an off-label use of the vaccine.
Literals and Constants in C#. Literal is a source code representation of a value, i.e. it is a value that has been hard-coded directly into your source. x is a variable, and 100 is a literal.
Macros using #define. You can define a macro in C using #define preprocessor directive. A macro is a fragment of code that is given a name. You can use that fragment of code in your program by using the name. Here, when we use c in our program, it's replaced by 3.1415.