Show the output produced by the following segments of code. Assume that all variables are declared as int.

w = -1;
for (h = -1; h

Question

Show the output produced by the following segments of code. Assume that all variables are declared as int.

w = -1;
for (h = -1; h <= 4; h+=2)
w = w + h;                              
cout << w;

BlackTom AI · Accepted Answer

The for-loop accumulates three h values (-1, 1, 3) into w, producing the final result 2.

Relevant knowledge points:
- for(initialization; condition; increment) executes the loop body while condition is true, updating the loop variable by the increment each iteration.
- w = w + h adds the current h to the running total w.
- With int variables, all arithmetic is integer and exact here (no truncation issues).

Step-by-step reasoning and intermediate calculations:
1. Initial assignments before the loop: w = -1. The for-loop initializes h = -1.
2. Loop condition: h <= 4. Since h = -1, condition true, enter first iteration.
   - First iteration: h = -1
     w = w + h = -1 + (-1) = -2
   - End of iteration, increment h by 2: h becomes -1 + 2 = 1
3. Second iteration: h = 1, check h <= 4 → true.
   - w = w + h = -2 + 1 = -1
   - Increment h: h = 1 + 2 = 3
4. Third iteration: h = 3, check h <= 4 → true.
   - w = w + h = -1 + 3 = 2
   - Increment h: h = 3 + 2 = 5
5. Fourth check: h = 5, condition h <= 4 is false, exit loop.

Final value: w = 2, so cout << w; prints 2.

Why other answers would be incorrect:
- A result like 0 would imply a different set or sign of h values or a mistaken initial w. The actual sum of the executed h values (-1 + 1 + 3) is 3; combined with initial w = -1 yields 2.
- A negative result (e.g., -3) would require adding more negative values than occur; the loop produces only one negative h (-1).

Conclusion: following the iterations and updates yields w = 2, which matches the provided correct answer 2.

Show the output produced by the following segments of code. Assume that all variables are declared as int. w = -1; for (h = -1; h <= 4; h+=2) w = w + h; cout << w;数值题

类似问题

How many times is the following loop executed: for (int i = 0; i < 10; i = i + 2) {}

The type of control structure shown is best described as a

What is the output of the following code? for (int x = 1; x <= 10; x++) { x += 3; System.out.print(x + " "); }

How many times will this loop iterate? for (i = 2; i < 10; i += 4) { ... }

Which control statement is best suited when the number of loop iterations is known in advance?

Question textFill in the blanks in order to write code that finds the sum of all the numbers from 5 up to and including 10. (Do not include any spaces). sum = 0for i in range(Answer 1 Question 9[input] , Answer 2 Question 9[input]): sum = sum + Answer 3 Question 9[input]

How do you initialize a 'for' loop to count from 10 down to 1?

What will be displayed after the following code is executed assuming num was initially set to zero? for n in range(0, 20, 5): num += n print(num)

更多留学生实用工具

智能学习助手

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