The isalnum() function is one of the Standard Library Function available in C language, which is used to check the given character is either an alphabet or a numeric value. In this article we will show you, How to use isalnum in C Programming language with example. Before we get into the example, the basic syntax of the isalnum in C language is as shown below.
C isalnum Function syntax
Below function will accept the single character as the parameter, and check whether the given character is either a number, or an alphabet.
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isalnum(char) |
isalnum in C Programming Example
The isalnum method (alpha numeric) is used to find the given character is either an alphabet, or numeric. This C program allows the user to enter any character, and check whether the character is between A to Z, or a to z, or a numeric value using the isalnum function.
C PROGRAM CODE
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//Example for isalnum in C Programming #include <stdio.h> #include <ctype.h> int main() { char ch; printf("Please Enter Either an Alphabet, or a Number: \n"); scanf("%c", &ch); if(isalnum(ch)) { printf("\n You have entered an Alphanumeric Character"); } else { printf("\n %c is not an Alphanumeric Character", ch); printf("\n I request you to enter Valid Number, or an Alphabet"); } } |
OUTPUT
Let me enter the Uppercase letter
Let me enter the Numeric value
ANALYSIS
First we declared a character variable called 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 Either an Alphabet, or a Number: \n"); scanf("%c", &ch); |
In this next line, we added the If Statement to check whether the character is between ‘A’ to ‘Z’, or ‘a’ to ‘z’, or a number using isalnum function. If the condition is True then the following statement will be printed
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printf("\n You have entered an Alphanumeric Character"); |
If the above condition is FALSE then the given character is not an Alphabet, or a number. So, it will print below statements
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printf("\n %c is not an Alphanumeric Character", ch); printf("\n I request you to enter Valid Number, or an Alphabet"); |
Above code is perfectly checking whether the given character is either an alphabet or a number. But what if, we enter the symbols
Let me try with the space character
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