Learning C
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C - isalnum function
Synopsis:
#include <stdio.h>
int isalnum(int c);
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Description:
The function returns nonzero if c is any of:
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
o 1 2 3 4 5 6 7 8 9
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Return Value
The function returns nonzero if c is alphanumeric otherwise this will return zero which will be equivalent to false.
Example
#include <stdio.h>
int main() {
if( isalnum( ';' ) )
{
printf( "Character ; is not alphanumeric\n" );
}
if( isalnum( 'A' ) )
{
printf( "Character A is alphanumeric\n" );
}
return 0;
}
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It will proiduce following result:
Character A is alphanumeric
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