Check for alphabet – “Not an alphabet” as True Condition – Computer Sir Ki Class

Check for alphabet – “Not an alphabet” as True Condition – Computer Sir Ki Class

Code Learning #CPP#1874

Check for alphabet – “Not an alphabet” as True Condition

Checking for user’s entry being not an alphabet first, else tell that it is an alphabet

Learning Objectives

Learning to check for out of range values first as true condition in a selection statement.

Source Code

Run Output

Enter an alphabet : 6

You did not enter an alphabet.



- OR -

Enter an alphabet : a

You did enter an alphabet.

Code Understanding

char c; cout<<“Enter an alphabet : “; cin>>c;
Collecting a character from the user.

if((c<‘A’ || c>’Z’) && (c<‘a’ || c>’z’))
Forming a condition where given character c is outside the alphabet range of upper case and lower case alphabets. When two out of range conditions are checked together they are qualified by || operator for inside conditions and && operator between two such out of range conditions.

{ cout<<“You did not enter an alphabet.”<<endl; }
Since the true condition appears when it is outside the range of being an alphabet, then it is reported accordingly.

else { cout<<“You did enter an alphabet.”<<endl;}
This is the case of false condition for check of not being an alphabet, which means the given character is definitely an alphabet.

Notes

In real world applications, out of range check is sometimes more efficient if the bulk of data coming in an stream is out of range.

Suggested Filename(s): notanalphabet.cpp

sunmitra| Created: 23-Dec-2017 | Updated: 15-Sep-2018|

Post Views: 450

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