From 025189ebf4a9543bc0d1f9c8dd880762f0d4a2ed Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <smadurange@users.noreply.github.com>
Date: Tue, 30 Nov 2021 19:41:19 +0800
Subject: 2.7

---
 2/7.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 2/7.c

(limited to '2')

diff --git a/2/7.c b/2/7.c
new file mode 100644
index 0000000..e35ec2e
--- /dev/null
+++ b/2/7.c
@@ -0,0 +1,23 @@
+#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[]) {
+    return 0;
+}
+
+unsigned invert(unsigned x, int p, int n) {
+  unsigned xUnset, xSet, xInv;
+
+  // mask to unset n bits starting at p:
+  xUnset = (~0 << p) | ~(~0 << (p - n));
+
+  // mask to extract bits to invert:
+  xSet = ~xUnset;
+
+  // mask out x and copy inverted bits into unset bits:
+  xInv = (x & xUnset) | ~(x & xSet);
+
+  return xInv;
+}
\ No newline at end of file
-- 
cgit v1.2.3