function returning pointer to structure in c

In the following example the getMax() function returns an integer pointer i.e., address of a variable that holds the greater value. Following is the function declaration syntax that will return pointer. Installing GoAccess (A Real-time web log analyzer). The parameter list is set to void which means this function takes no argument. In line 14, a pointer variable ptr_dog of type struct dog is declared.. Next we are calling the getMax() function and passing the address of variable x and y. Static Variables have a property of preserving their value even after they are out of their scope. List of the Best Game Design and Programming Schools in the U.S. What Is the Average Pay for a Computer Programming Masters Degree? When the above code is compiled together and executed, it produces the following result −. This means spike and *ptr_dog are functionally equivalent. . } The return type of the function is of type struct student which means it will return a value of type student structure. By using our site, you Inside your function, perform whatever operations are needed to accomplish your goals. Now ptr_dog points to the structure variable spike. This shows us that the value of us_leader was actually changed in the change_leader function, and the main function received the updated value. You can test out of the 4) Like normal pointers, we can have an array of function pointers. In line 13, a variable called my_dog of type struct dog is declared and initialized. Finally, we return the struct from the function. and career path that can help you find the school that's right for you. Following is the function declaration syntax that will return pointer.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Similarly, C also allows to return a pointer from a function. Returning a Structure Pointer from Function # In the last section, we have learned that a function can return a structure variable. In order to modify the actual values of variables, the calling statement passes addresses to pointer parameters in a function. If we want to be able to change the structure inside of our function, we pass it by reference instead. The new_leader function shown creates a new structure and populates it with the values we specify, then returns it to the calling function so that it can be used. We use cookies to ensure you have the best browsing experience on our website. All other trademarks and copyrights are the property of their respective owners. We have already seen a function can return data of types int, float, char etc. Get the unbiased info you need to find the right school. Second point to remember is that, it is not a good idea to return the address of a local variable outside the function, so you would have to define the local variable as static variable. The syntax is different when using the references, because referencing and dereferencing pointers are now involved. Pointers in C programming language is a variable which is used to store the memory address of another variable. How to use a function pointer in C structure.

We can pass pointers to the function as well as return pointer from a function. Log in or sign up to add this lesson to a Custom Course. This structure is called country_leader. Then we are creating an integer pointer variable max which will hold the address of the variable that has the greater value. Recall that postfix ++ operator and -> have the same precedence and associates from left to right. The return statement specifies the value to return. Donald Trump has been the President of the US since 2017. In the previous tutorial we learned how to create functions that will accept pointers as argument. In line 23, a new name is assigned to ptr_dog using the strcpy() function, because we can't assign a string value directly to ptr_dog->name using assignment operator. So, integer pointer variable m holds the address of the variable x i.e., 1000 and is allocated the memory location 8000. We create a struct inside of our function to hold the struct we'll be returning.

You can modify the structure inside of the function, and the values won't be changed outside of that function.

Writing code in comment? C - Input Output operation using scanf and printf functions, C - Switch Case decision making statements, C - Pointers and Variables Memory Representation, C - Pointers and Functions - Call by Value and Call by Reference, C - Passing structure pointer to function, C - File Handling - Read and Write Characters, C - File Handling - Read and Write Integers, C - File Handling - Read and Write multiple data, C - File Handling - Randomly Access Files, C - Dynamic Memory Allocation - Getting Started, C - Dynamic Memory Allocation - malloc function, C - Dynamic Memory Allocation - calloc function, C - Dynamic Memory Allocation - realloc function, Design Patterns - JavaScript - Classes and Objects, Linux Commands - lsof command to list open files and kill processes.

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