Question

What is the output of the following segment of code if the value 4 is input by the user?

int num;
int total = 0;
cout << "Enter a number from 1 to 10: ";
cin >> num;
switch (num)
{
case 1:
case 2: total = 5;
case 3: total = 10;
case 4: total = total + 3;
case 8: total = total + 6;
default: total = total + 4;
}
cout << total << endl;
a. 0
b. 3
c. 13
d. 23
e. None of these

Answer 1

Analyzing the given C++ switch statement, the output, with fall-through behavior and no breaks, for the input value 4 will be 13. This is achieved by adding 3, 6 and then 4 to the initial total of 0.

Step-by-step explanation:

The question involves analyzing a segment of C++ code to determine the output when the input is 4. The code uses a switch statement without break statements, causing a fall-through behavior. Let's follow the code step by step with the input value 4:

• Initially, total is set to 0.
• The switch statement begins to execute from the case that matches the input, so execution starts from case 4.
• Since there is no break, the execution falls through to the subsequent cases.
• In case 4, 3 is added to total, changing it from 0 to 3.
• Fall-through continues to case 8, where 6 is added to total, changing it from 3 to 9.
• Fall-through continues to default, where 4 is added to total, changing it from 9 to 13.

Therefore, the final value of total when the input is 4 will be 13, so the correct answer is option c. 13.