Added exercise 1-1

diff --git a/1/1.c b/1/1.c
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+/*
+       Exercise 1-1. Run the "hello, world" program on your system. Experiment with
+       leaving out parts of the program, to see what error messages you get.
+       ===
+
+       On executing the full program I got a warning from GCC, as I had not specified
+       the return type of the "main" function, as the "-Wimplicit-int" option is
+       enabled by default. As per the man page, this can be disabled by passing the
+       argument "-Wno-implicit-int". I can also suppress the message by simply
+       specifying the return type, stating "int" before "main". Trying both of these
+       suppressed the message, though I left the code as in the text. Nonetheless, the
+       code compiles and works either way.
+
+       On removing the "include" statement, GCC warns me of an implicit declaration of
+       "printf", noting that I must include "stdio.h" or define "printf". Though GCC,
+       being intelligent, compiles nonetheless.
+
+       On removing "main", compilation failed, and I got an error, as the compiler
+       expected an identifier before the parenthesis.
+
+       Removal of the curly braces results in simple failure.
+*/
+
+#include <stdio.h>
+
+main () {
+       printf("hello, world\n");
+}