From c800a6727d58641f97db0f24a6e3ad1076a4eec7 Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <smadurange@users.noreply.github.com>
Date: Wed, 1 Dec 2021 21:44:14 +0800
Subject: Clean up.

---
 2/6.c | 17 +----------------
 2/7.c | 15 ---------------
 2/8.c | 11 -----------
 2/9.c |  4 ----
 4 files changed, 1 insertion(+), 46 deletions(-)

diff --git a/2/6.c b/2/6.c
index bf8cf2f..bb8c1de 100644
--- a/2/6.c
+++ b/2/6.c
@@ -1,21 +1,6 @@
 #include <stdio.h>
 
-unsigned setbits(unsigned x, int p, int n, unsigned y);
-
-int main(int argc, char *argv[]) {
-  int p, n;
-  unsigned x, y;
-
-  p = 5;
-  n = 3;
-  x = 0;
-  y = 7;
-
-  printf("New bit field: %x\n", setbits(x, p, n, y));
-
-  return 0;
-}
-
+/* sets the n bits of x starting at p to rightmost n bits of y  */
 unsigned setbits(unsigned x, int p, int n, unsigned y) {
   unsigned yLO, yLOA, xUnset, xPrime;
 
diff --git a/2/7.c b/2/7.c
index 0c2ae6f..97af143 100644
--- a/2/7.c
+++ b/2/7.c
@@ -1,21 +1,6 @@
 #include <stdio.h>
 
 /* inverts n bits of x starting at p */
-unsigned invert(unsigned x, int p, int n);
-
-int main(int argc, char * argv[]) {
-  int n, p;
-  unsigned x;
-
-  n = 3;
-  p = 5;
-  x = 0xB7;
-
-  printf("result: %x\n", invert(x, p, n));
-
-  return 0;
-}
-
 unsigned invert(unsigned x, int p, int n) {
   unsigned mask, y;
 
diff --git a/2/8.c b/2/8.c
index 2d57301..4ce829b 100644
--- a/2/8.c
+++ b/2/8.c
@@ -1,17 +1,6 @@
 #include <stdio.h>
 
 /* rotates x to the right by n positions */
-unsigned rightrot(unsigned x, int n);
-
-int main(int argc, char *argv[]) {
-    unsigned x;
-
-    x = rightrot(0x7, 3);
-    printf("rotated: %x\n", x);
-
-    return 0;
-}
-
 unsigned rightrot(unsigned x, int n) {
     return (x >> n) | (x << (32 - n));
 }
\ No newline at end of file
diff --git a/2/9.c b/2/9.c
index 06a675a..7df5637 100644
--- a/2/9.c
+++ b/2/9.c
@@ -1,10 +1,6 @@
 #include <stdio.h>
 
 /* counts 1-bits in x */
-int bitcount(unsigned x);
-
-int main(int argc, char *argv[]) { return 0; }
-
 int bitcount(unsigned x) {
   // Explanation: on a two's complement system, x - 1 is performed by 
   // adding the two's complement of 1 (i.e. 111...1) to x. Adding 1 to
-- 
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