diff --git a/education/software development/ECE1400/Chapter 13 Exercises.md b/education/software development/ECE1400/Chapter 13 Exercises.md
index aa0c798..03deb8c 100644
--- a/education/software development/ECE1400/Chapter 13 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 13 Exercises.md	
@@ -5,4 +5,17 @@ c. `printf(%s, '\n');` - This is invalid because it's trying to display a `char`
 e. `printf('\n');` - `printf`'s first argument should be a string, not a `char`.
 h. `putchar("\n");` - `putchar`'s first argument should be a `char`, not a string.
 i. `puts('\n');` - `puts`'s first argument should be a string, not a `char`.
-j. `puts("\n");` - `puts` will write a newline after writing a string, so this will write two newlines. 
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+j. `puts("\n");` - `puts` will write a newline after writing a string, so this will write two newlines. 
+
+> 2. Suppose that `p` has been declared as follows:
+```c
+char *p = "abc";
+```
+> Which of the following function calls are legal? Show the output produced by each legal call, and explain why all the others are illegal.
+```c
+// A - Not legal, because putchar accepts a `char`, not a pointer.
+putchar(p);
+// B - Legal, output: `a`
+
+
+```
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