1 files changed, 19 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_PRACTICAL_C/11_1.c b/reference/C/CONTRIB/OR_PRACTICAL_C/11_1.c
new file mode 100644
index 0000000..cc1ce51
--- /dev/null
+++ b/reference/C/CONTRIB/OR_PRACTICAL_C/11_1.c
@@ -0,0 +1,19 @@
+/*
+ * Define a variable to hold an integer or 
+ * a real number (but not both)
+ */
+union value {
+    long int i_value;   /* The real number */
+    float f_value;      /* The floating-point number */
+} data;
+int i;                  /* Random integer */
+float f;                /* Random floating-point number */
+main()
+{
+    data.f_value = 5.0;
+    data.i_value = 3;   /* data.f_value overwritten */
+    i = data.i_value;   /* legal */
+    f = data.f_value;   /* not legal, will generate unexpected results */
+    data.f_value = 5.5; /* put something in f_value/clobber i_value */
+    i = data.i_value;   /* not legal, will generate unexpected results */
+}