Check for alphabet – “Is an alphabet” as True Condition – Computer Sir Ki Class


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Check for alphabet – “Is an alphabet” as True Condition

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

Learning Objectives

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

Source Code

TC++ #1876


Source Code

Run Output

Enter an alphabet : A
You entered and alphabet.

- OR -
Enter an alphabet : #
You did not 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 inside the alphabet range of upper case and lower case alphabets. When two inside range conditions are checked together they are qualified by && operator for inside conditions and || operator between two such out of range conditions.

{cout<<“You entered and alphabet.”<<endl;}
Since the true condition appears when it is inside of the range of being an alphabet, then it is reported accordingly.

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


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

Suggested Filename(s): notanalphabet.cpp


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

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