Enter the day number of week(1-7) : 1

Monday



-OR-

Enter the day number of week(1-7) : 7

HOLIDAY



-OR-

Enter the day number of week(1-7) : 8

Error in input

Code Understanding

switch (d) {
The integer value of day value input is passed to switch.

case 1: cout <<“Monday”; break;
case 2: cout <<“Tuesday”;break;
case 3: cout <<“Wednesday”;break;
case 4: cout <<“Thursday”;break;
case 5: cout <<“Friday” ;break;
For first five cases from 1 to 5 the day name is output. after outputting each name a break is given so that program exits the switch selection and goes to line after the switch.

case 6:
case 7: cout <<“HOLIDAY” ;break;
For both case 6 and 7 value of day number, HOLIDAY is printed. This is also called fall through as condition at values 6 falls through the condition for next case at 7.

default: cout <<“Error in input”;
If none of cases finds a match, means the value given by user is not available from case 1 to 7 then this default case is executed.

Notes

• Switch case can always  be implemented by if-else-if ladder.
• Its construct is like a single pole muti throw switch used on electrical circuits. Things like fan regulator, radio band switch use these kind of switching mechanism.

Common Errors

• The break command in case statement is often missed by programmers. If it is not given then fall through action happens.
• Switch case bracket positions have to be properly remembered.
• The case <value>: syntax is often incorrectly written by using semicolon or comma.

Suggested Filename(s): daysofweek.cpp