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


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Code Learning #CPP#1874 siteicon   siteicon   siteicon  

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

TC++ #1874


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.


  • 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|

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