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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