Switch case with fall through example. – Computer Sir Ki Class

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Solved Problem #CPP#2371 siteicon   siteicon   siteicon  

Problem Statement - Switch case with fall through example.

Write the output of the following code based on the switch-case selection when the user input is B, L, D or S. Assume inclusion of appropriate header files.

int main ( )
{ 
  char m;
  cout<<"Enter meal type (B/L/D): ";
  cin>>m;
  switch (m)
  {
    case 'B': 
    case 'b':cout<<"Have some thing. ";
    case 'L':
    case 'l':cout<<"Come to Dining Table.";break;
    case 'D':
    case 'd':cout<<"Let's go outside."; break;
    default: cout <<"Error in input";
  }
  return 0 ;
}

Solution

TC++ #2371

 

Run Output

Enter meal type (B/L/D): B
Have some thing. Come to Dining Table.

-OR-
Enter meal type (B/L/D): L
Come to Dining Table.

-OR-
Enter meal type (B/L/D): D
Let's go outside.

-OR-
Enter meal type (B/L/D): S
Error in input

Case B or b will fall through till the L or L case as there is no break after case B instructions. So the output will be from instruction in case B and in case L.

Case L will print its own instructions as there is a break after it.

Case  D will also print its own instruction as again there is a break after it.

For any other value Error in Input shall be printed.

Common Errors

  • The switch case construct problems need careful observation of break statements after the last instruction in a case group. If it is not there fall-through to next instruction will essentially be there.


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sunmitra| Created: 8-Jan-2018 | Updated: 19-Feb-2020|






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