What will be the output of the following program?#include using namespace std; int main() { int arr[] = {5, 10, 15, 20}; for (auto elem : arr) { elem += 5; } for (auto elem : arr) { cout

Question

What will be the output of the following program?#include <iostream> using namespace std; int main() {
int arr[] = {5, 10, 15, 20}; for (auto elem : arr) {
elem += 5; }
for (auto elem : arr) {
cout << elem << " "; }
return 0; }

BlackTom AI · Accepted Answer

The question presents a C++ program and asks for its output. There are no explicit answer options provided in the option list, but the given answer field mentions 'b. 5 10 15 20'.

First, consider what the code does. The array arr is initialized as {5, 10, 15, 20}. The first range-based for loop uses 'for (auto elem : arr)' which copies each element into the variable elem. Inside the loop, the statement 'elem += 5;' increases the local copy by 5, but does not modify the original array because 'elem' is a separate copy, not a reference to the array element.

Because no assignment back to the array occurs, the elements of arr remain unchanged after the first loop. In the second range-based for loop, 'for (auto elem : arr)', again elem is a copy of each array element, and we print 'elem' followed by a space. Since arr is still {5, 10, 15, 20}, the output will be '5 10 15 20' with a trailing space.

Now addressing the stated options: since the options are not provided in the list, we can still evaluate the result against the described option 'b. 5 10 15 20'. The observed output matches this sequence exactly, given the lack of modifications to the original array.

Key takeaway: range-based for loops with 'auto' create copies of elements by default; modifying the loop variable does not alter the underlying array unless the loop variable is a reference (e.g., 'for (auto& elem : arr)' or 'for (int& elem : arr)'). In this code, because copies are used, the array remains unchanged and prints its original values.

CPT111W PRINSIP PENGATURCARAAN (PRINCIPLES OF PROGRAMMING)

What will be the output of the following program?#include <iostream> using namespace std; int main() { int arr[] = {5, 10, 15, 20}; for (auto elem : arr) { elem += 5; } for (auto elem : arr) { cout << elem << " "; } return 0; }

查看解析

登录即可查看完整答案

类似问题

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

Under the assumptions used in cost-volume-profit analysis, as the activity increases:

The CVP and break-even analysis are supported by a range of important assumptions. Which of the following is not an assumption of the CVP:

The break-even point is that at which:

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单