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

if(d==1) cout<<“Monday”;
else if(d==2) cout <<“Tuesday”;
else if(d==3) cout <<“Wednesday”;
else if(d==4) cout <<“Thursday”;
else if(d==5) cout <<“Friday”;

For first five cases from 1 to 5 re checked with if else ladder and the day name is output. No break is required here like a switch-case construct as each item after the first one is in else-if condition.

else if(d==6 || d==7) cout <<“HOLIDAY”;
For both case 6 and 7 value of day number, HOLIDAY is printed. The fall through of switch-case is implemented here as multiple comparison check.

else 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 else  is executed. This is like the default case of switch.

Notes

• Switch case can always  be implemented by if-else-if ladder but vice-versa is not always true.

Common Errors

• Proper if-else-if construct removes the need of break in switch case. The break may be there for other reasons required by the program.

Suggested Filename(s): daysofweek-ifelse.cpp