C Reference Alphanumeric Test: isalnum()
The function isalnum() returns a non-zero if its argument is a letter of the alphabet or a numeric digit. If it is not letter of the alphabet or a numeric digit, then zero is returned.
isalnum() source code example:
#include<stdio.h>
#include<ctype.h>
int main()
{
char a;
scanf( "%c", &a );
if( isalnum(a) )
printf( "This is an alphanumeric character: %c\n", a );
else
printf( "This is NOT an alphanumeric character: %c\n", a );
return 0;
}
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