3.6 Passing arrays and strings to functions

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Passing Arrays to Functions (or) Passing Array as an Argument to a Function in C : -

  • When we pass an array to a function, that means we are passing the address of the first element of the array, not a copy of the entire array.
  • When you pass an array to a function, we actually pass the base address (memory address of the first element) of the array, not a copy of all its elements. This means any change made to the array inside the function will affect the original array.

            Syntax: -


            Example: -


            Example: -


            Output: -



Passing Strings to Functions: -

  • When we pass a string to a function, we are actually passing the address of the first element of the array.
  • This is why strings in C are considered to be passed by reference in effect, even though C does not have true pass-by-reference.

            Example: -



            Output: -



Inline functions: -

  • An inline function is a function for which the compiler attempts to insert the function’s code directly at the point of each call rather than performing a standard function call.
  • This helps reduce function call overhead and can improve performance for small, frequently called functions.

            Syntax: -


            Example: -



            Output: -


  • Instead of performing a normal function call, the compiler may replace square(a) with a * a in the compiled code.
  • This avoids the overhead of a function call.
  • static restricts the function to the current file, so the linker does not need an external reference.


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