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#include <stdio.h> int isalpha(int c);
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
The function returns nonzero if c is just alpha otherwise this will return zero which will be equivalent to false.
#include <stdio.h> int main() { if( isalpha( '9' ) ) { printf( "Character 9 is not alpha\n" ); } if( isalpha( 'A' ) ) { printf( "Character A is alpha\n" ); } return 0; }
It will proiduce following result:
Character A is alpha
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