lcthw ex14 extra credit

lcthw/ex14.c

@@ -1,27 +1,27 @@
 #include <stdio.h>
 #include <ctype.h>
+#include <string.h>
 
 // forward declarations
-int can_print_it(char ch);
-void print_letters(char arg[]);
+void print_letters(size_t len, char arg[]);
 
 void print_arguments(int argc, char *argv[])
 {
 	int i = 0;
 
 	for (i = 0; i < argc; i++) {
-		print_letters(argv[i]);
+		print_letters(strlen(argv[i]), argv[i]);
 	}
 }
 
-void print_letters(char arg[])
+void print_letters(size_t len, char arg[])
 {
 	int i = 0;
 
-	for (i = 0; arg[i] != '\0'; i++) {
+	for (i = 0; i < len; i++) {
 		char ch = arg[i];
 
-		if (can_print_it(ch)) {
+		if (isprint((int)ch)) {
 			printf("'%c' == %d ", ch, ch);
 		}
 	}
@@ -29,11 +29,6 @@ void print_letters(char arg[])
 	printf("\n");
 }
 
-int can_print_it(char ch)
-{
-	return isalpha((int)ch) || isblank((int)ch);
-}
-
 int main(int argc, char *argv[])
 {
 	print_arguments(argc, argv);