The isalpha() function is one of the Standard Library Function available in C language, which is used to check the given character is an alphabet or not. In this article we will show you, How to use isalpha in C Programming language with example. Before we get into the example, the basic syntax of the isalpha in C language is as shown below.
C isalpha Function syntax
Below function will accept the single character as the parameter, and check whether the given character is an alphabet or not.
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isalpha(char) |
isalpha in C Programming Example
The isalpha method is used to find the given character is an alphabet or not. This C program allows the user to enter any character, and check whether the character is between A to Z, or a to z using the isalpha function.
C PROGRAM CODE
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//Example for isalpha in C Programming #include <stdio.h> #include <ctype.h> int main() { char ch; printf("Please Enter Any Valid Character: \n"); scanf("%c", &ch); if(isalpha(ch)) { printf("\n You have entered an Alphabet"); } else { printf("\n %c is not an Alphabet", ch); printf("\n I request you to enter Valid Alphabet"); } } |
OUTPUT
Let me enter the Uppercase letter
ANALYSIS
First we declared a character variable called ch
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char ch; |
Following statement will ask the user to enter any character. And then we are using the scanf to assign the user entered character to ch variable
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printf("Please Enter Any Valid Character: \n"); scanf("%c", &ch); |
In this next line, we added the If Statement to check whether the character is between ‘A’ and ‘Z’ using isalpha function. If the condition is True then the following statement will be printed
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printf("\n You have entered an Alphabet"); |
If the above condition is FALSE then the given character is not Alphabet. So, it will print below statements
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printf("\n %c is not an Alphabet", ch); printf("\n I request you to enter Valid Alphabet"); |
Above code will definitely check whether the given character is an alphabet or not, but what if, we enter the numeric value
TIP: Please refer C Program to check whether the Character is Alphabet or Not article to understand, How to check whether the character is alphabet without using the isalpha function.
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