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Chapter 8: Problem 25

When you pass an array name as an argument to a function, what is actually being passed?

Short Answer

Expert verified
Answer: When an array name is passed as an argument to a function, the memory address (pointer) of the first element in the array is actually being passed. This allows the function to access and manipulate the array elements efficiently in terms of memory and processing time.

Step by step solution

01

Understanding Arrays and Functions

In programming, an array is a data structure that can store multiple elements of the same type. A function, on the other hand, is a reusable piece of code that can take input, perform specific operations, and return output. We can pass an array to a function to perform operations on the elements of the array.
02

Array Name as a Pointer

When you pass an array name as an argument to a function, you are actually passing the address (memory location) of the first element of the array. In other words, the array name acts as a pointer to the first element in the array. The function uses this address to access and manipulate the elements of the array.
03

Advantages of Passing Array Name

Since passing the array name to a function only involves passing the memory address of the first element, it saves time and memory. If we were to pass the entire array, it would consume more memory and processing time, especially for large arrays.
04

Accessing Array Elements in Functions

Once the address of the array's first element is passed to the function, the function can use pointer arithmetic to access other elements in the array. For example, if the array name points to the first element, adding 1 to the pointer would point to the second element, adding 2 would point to the third element, and so on.
05

Conclusion

When passing an array name as an argument to a function, we are actually passing the memory address (pointer) of the first element in the array. This allows the function to access and manipulate the array elements efficiently in terms of memory and processing time.

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Most popular questions from this chapter

The size declarator must be \(a(n)\) _______ with a value greater than ______.

Starting values for the elements of an array may be specified with a(n) ____ list.

Assume that array 1 and array 2 are both 25 -element integer arrays. Indicate whether each of the following statements is legal or illegal. A) arrayl = array2: B) cout \(\langle\langle\text { array } 1:\) C) \(\operatorname{cin} \gg\) array 2

Look at the following array definition. int numbers \([5]=11,2,31\) A) What value is stored in numbers [2]\(?\) B) What value is stored in numbers [4]\(?\)

Use the following Car structure declaration to answer questions \(28-30\). struct Car string make model: Int year: double cost: // Constructors \(\operatorname{Car}()\) { make \(=\) model \(=" " ;\) year \(=\cos t=0: 1\) } Car(string mk, string md. int yr, double c) { make \(=\) whe model \(=\) ind : year \(=y r ; \quad \cos t=c: 1\)} Write a loop that will step through the array you defined in question 29 , displaying the contents of each element.
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