Chapter 9: Problem 14

The __________ operator can be used to determine a variable’s address.

Short Answer

Expert verified

The operator used to determine the address of a variable is the "address-of" operator, represented by the ampersand (&) symbol. It is a unary operator and returns the memory address of its operand. This operator is especially useful when working with pointers in C or C++, as pointers store memory addresses rather than direct values of variables. For example, if we have an integer variable 'num' and want to store its address in a pointer 'ptr', we would use the address-of operator like this: `ptr = #`. When printed, it will display the memory address where 'num' is stored.

Step by step solution

Identify the correct operator

The operator used to determine the address of a variable is the "address-of" operator, which is represented by the ampersand (&) symbol.

Explain the purpose and usage of the address-of operator

The address-of operator (&) is a unary operator that returns the memory address of its operand. This can be useful when working with pointers in C or C++, as pointers contain memory addresses, rather than the direct value of a variable.

Provide an example of using the address-of operator

Let's consider a simple example in C++ where we will use the address-of operator to obtain the memory address of a variable: ```cpp #include int main() { int num = 42; // Declare an integer variable int* ptr; // Declare a pointer to an integer ptr = # // Store the address of 'num' in 'ptr' std::cout << "Value of num: " << num << std::endl; // Output: Value of num: 42 std::cout << "Address of num using address-of operator: " << # << std::endl; // Output: Address of num using address-of operator: 0x7ffee std::cout << "Address stored in the pointer ptr: " << ptr << std::endl; // Output: Address stored in the pointer ptr: 0x7ffee std::cout << "Value stored at the address in ptr: " << *ptr << std::endl; // Output: Value stored at the address in ptr: 42 return 0; } ``` In this example, we declared an integer variable 'num', a pointer 'ptr', and used the address-of operator (&) to store the memory address of 'num' in 'ptr'. We then used std::cout to display the variable's value, its address using the & operator, the address stored in the pointer 'ptr', and the value stored at that address using the dereference (*) operator.

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The __________ operator can be used to determine a variable’s address.

Short Answer

Step by step solution

Identify the correct operator

Explain the purpose and usage of the address-of operator

Provide an example of using the address-of operator

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