The concept of call by reference can be better understood if one tries to look into what a reference actually is and how a variable of a class type is represented. When we declare a reference type variable, the compiler allocates only space where the memory address of the object can be stored. Function call by reference in C. The call by reference method of passing arguments to a function copies the address of an argument into the formal parameter. Inside the function, the address is used to access the actual argument used in the call. It means the changes made to the parameter affect the passed argument. To pass a value by reference. Program to swap two number using call by reference. /* C Program to swap two numbers using pointers and function. The address of memory location num1 and num2 are passed to the function swap and the pointers *n1 and *n2 accept those values. So, now the pointer n1 and n2 points to the address of num1 and num2 respectively.
Call by reference programs to
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