Call by Reference
Call by reference is the method in C where we call the function with the passing address as arguments. We pass the address of the memory blocks which can be further stored in a pointer variable that can be used in the function. Now, changes performed in the values inside the function can be directly reflected in the main memory.
Example:
C
// C Program to implement // Call by reference #include <stdio.h> // Call by reference void swap(int* x, int* y) { int temp = *x; *x = *y; *y = temp; } // Driver Code int main() { // Declaring Integer int x = 1, y = 5; printf("Before Swapping: x:%d , y:%d\n", x, y); // Calling the function swap(&x, &y); printf("After Swapping: x:%d , y:%d\n", x, y); return 0; } |
Output
Before Swapping: x:1 , y:5 After Swapping: x:5 , y:1
C Function Arguments and Function Return Values
Prerequisite: Functions in C
A function in C can be called either with arguments or without arguments. These functions may or may not return values to the calling functions. All C functions can be called either with arguments or without arguments in a C program. Also, they may or may not return any values. Hence the function prototype of a function in C is as below:
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