Question

hi my question is
what is need of fuction declaration​

Answer 1

Answer:

A function declaration tells the compiler about a function name and how to call the function. ... Function declaration is required when you define a function in one source file and you call that function in another file. In such case, you should declare the function at the top of the file calling the function.

Answer 2

Explanation:

A function declaration tells the compiler about the number of parameters function takes, data-types of parameters and return type of function. Putting parameter names in function declaration is optional in the function declaration, but it is necessary to put them in the definition.

Note: The C standard library provides numerous built-in functions that your program can call.