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Write a C program to check a char: is it a alphanumeric char.

By Dinesh Thakur

An alphanumeric character is one that is either an uppercase or lowercase letter or a digit. The statement given below tests whether character ch is an alphanumeric character or not.


#include<ctype.h>
#include<stdio.h>
#include<conio.h>
void main()
{
char ch;
for(;;){
ch = getchar();
if(ch=='.')
break;
if(isalnum(ch)) printf("%c is alphanumeric\n", ch);
}
getch();
}
 
OUTPUT:  
a
a is alphanumeric

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About Dinesh Thakur
Dinesh ThakurDinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.


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