Passing Structure to Function Call by Reference Structures can be passed by reference just as other simple types. For example, notice the following code fragment: A function may even return a reference to a structure also. When a structure is passed by reference the called function declares a reference for the passed structure and refers to the original structure elements through its reference.
The entire structure can be passed to the functions both ways by value and by reference. The function prnsum creates references l1 and l2 for structures length1 and length2 and thus, uses the original structures length1 and length2 by names l1 and l2 respectively.
The above program invokes prnsum by passing structures length1 and length2 by reference. If You want that the values of the structure elements should not be altered by the function, then you should pass the structure elements by value and if you want the function to alter the original values, then you should pass the structure elements by reference.
The above program inputs two structures length1 and length2 of distance type and prints the sum of the two. Then the return type of the function is the same as that of the type of the structure returned.
Passing Structure Elements to Functions When an element of a structure is passed to a function, you are actually passing the values of that element to the function. Passing Structure to Function Call by Reference Example Following example program illustrates passing of structures to function with call by reference method: Thus the original copies length1 and length2 remains untouched.
Passing Entire Structure to Function Passing entire structures makes the most sense when the structure is relatively compact. The definition of the function prnsum of program no.
But remember if one of the structure elements happens to be an array, it will automatically be passed by reference as the arrays cannot be passed by value.
For example, consider the following function: But, if you have a structure local to a function and you need to pass its values to another function, then it can be achieved in two ways: Passing Structure to Function Call by Value Example Consider the following example program, demonstrating how to pass structure to function with call by value method: Thus, the called function works with the original values.
For example, consider the following structure: The function can either receive the values by creating its own copy for them call by value or by creating references for the original variables call by reference.
Of course, this means that any changes made to the contents of the structure inside the function to which it is passed do not affect the structure used as an argument.
Passing by value is useful when the original values are not to be changed and passing by reference is useful when original values are to be changed. The receiving parameter for the passed structure must match the type of the passed structure.
For example, if the function prnsum of the above 2 programs i. When a function returns a reference, it returns the lvalue location value in place of rvalue data value of a variable. Therefore, it is just like passing a simple variable unless, of course, that element is complex such as an array of character.
A function prnsum is invoked by passing two structures length1 and length2 by value and which calculates the sum of the two and prints it.Passing structure variable to a function in C programming language.
You can pass a structure to a function as argument like we pass any other variable to a function. Structure variable is passed using call by value. In this program, user is asked to enter the name, age and salary of a Person inside main() function.
Then, the structure variable p is to passed to a function using. displayData(p); The return type of displayData() is void and a single argument of type structure Person is passed.
Then the members of structure p is displayed from this function. Example program – passing structure to function in C by value: In this program, the whole structure is passed to another function by value. It means the whole structure is passed to another function with all members and their values.
Passing Array of Structure to Function in C Programming Array of Structure can be passed to function as a Parameter. function can also return Structure as return type.
Write a C++ Program to Pass an array in a function. Here’s simple Program to Pass an array in a function in C++ Programming Language. If structure is passed by value, changes made to the structure variable inside the function definition does not reflect in the originally passed structure variable.
C program to create a structure student, containing name and roll and display the information.Download