diff --git a/education/software development/ECE1400/Chapter 12 Exercises.md b/education/software development/ECE1400/Chapter 12 Exercises.md
index 2ae3dfc..dd4ccab 100644
--- a/education/software development/ECE1400/Chapter 12 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 12 Exercises.md	
@@ -17,3 +17,8 @@ middle = low + (high - low) / 2;
 3. What will be the contents of the `a` array after the following statements are executed?
 ```c
 {10, 9, 8, 7, 6, 5, 4, 3, 2, 1}
+```
+
+5. Suppose that `a` is a one dimensional array and `p` is a pointer variable. assuming that the assignment `p = a` has just been performed, which of the following expressions are illegal because of mismatched types? Of the remaining expressions, which are true (have a nonzero value)?
+The following expressions are illegal because of mismatched types:
+- ``
\ No newline at end of file