old c,cc examples

1 files changed, 51 insertions, 0 deletions

diff --git a/c,cc/bitwise.c b/c,cc/bitwise.c
new file mode 100644
index 0000000..c90bfbd
--- /dev/null
+++ b/c,cc/bitwise.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+
+
+void
+test1()
+{
+  int foo[4] = {147, 142, 207, 19};
+  unsigned long result = 0;
+
+  for( int i = 0; i < 4; i += 1 )
+  {
+    result = result<<8;  // 8 bit left
+    result = foo[i]|result;
+  }
+
+  printf("%lx\n", result);
+}
+
+void
+test2(void)
+{
+  int foo[4];
+  unsigned long bar = 0x938ecf13;
+
+  for( int i = 0; i < 4; i += 1 )
+  {
+    foo[i] = (bar>>i*8)&255;
+
+    printf("%d\n", foo[i]);
+  }
+}
+
+void
+test3(void)
+{
+  int s = 12;
+  unsigned long foo = 0xffffffff;
+
+  foo = foo<<s;
+  printf("%lx\n", foo);
+}
+
+int main(void)
+{
+  test1();
+  test2();
+  test3();
+
+  return 0;
+}
+