More versions of printing out argv.

modules/program-arguments.md

@@ -86,8 +86,10 @@ Some `printf()` implementations barf on a null pointer when printing via the
 `%s` format string.
 
 Code:
+- #solution argv-do-while.c
 - #solution argv-while.c
 - #solution argv-for.c
+- #solution argv-for-v2.c
 - #solution argv-nodash.c
 - #solution print-argv-recursively.c
 

src/argv-do-while.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int
+main(int argc, char *argv[])
+{
+	do {
+		printf("%p '%s'\n", *argv, *argv);
+	} while (*++argv != NULL);
+}

src/argv-for-v2.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int
+main(int argc, char **argv)
+{
+	/* Not a nice way of doing things but shown as possible. */
+	for ( ; *argv != NULL; printf("'%s'\n", *argv++))
+		;
+}

src/argv-while.c

@@ -1,11 +1,9 @@
 #include <stdio.h>
 
 int
-main(int argc, char *argv[])
+main(int argc, char **argv)
 {
-	char **p = argv;
-
-	do {
-		printf("%p '%s'\n", *p, *p);
-	} while (*++p != NULL);
+	while (*argv++ != NULL) {
+		printf("'%s'\n", *(argv - 1));
+	}
 }