Correct statements of similarities and differences between calling user defined functions and library functions are:
a. Similarity: A call to either requires the function name followed by parenthesized comma separated list of arguments that match the prototype in number and type.
b. Difference: Library functions require inclusion of header files for declarations but user defined functions do not require any declaration before use.
c. Similarity: Either library or user defined functions may be value returning or void functions.
d. Difference: Library functions all provide a return value, user functions must be void functions.
e. Difference Library function declarations (sometimes definitions) come from #include
Similarities are a) c) e)
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A theme:
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