Question

Show the output from the following statements.

int a=2,b=7,c=0;
switch(a) \
{
case 0:c+=1;
case 1: c+=2;
case 2: c+=4;
case 3:c+=8;
default : c+=16;
}
cout ≪

Answer 1

The output of the provided C++ statements, which include a switch statement without break commands, would be 28, as the program adds 4, 8, and 16 to the initial value of c which is 0.

Step-by-step explanation:

The student's question revolves around providing the output of a given sequence of statements within a C++ switch statement. When executing the code, since there are no break statements, after matching case 2, the program will execute all subsequent cases and the default case because it falls through. Here's the step-by-step explanation:

1. The switch is based on the value of a which is 2.
2. The program matches case 2 and adds 4 to c (c += 4).
3. Without a break, it continues to execute case 3, adding another 8 to c (c += 8).
4. Finally, it executes the default case, adding 16 to c (c += 16).

Therefore, the total value of c after executing the switch statement is 0 (initial value) + 4 (case 2) + 8 (case 3) + 16 (default) = 28. The output of the cout statement will thus be 28.