diff --git a/education/software development/ECE1400/C.md b/education/software development/ECE1400/C.md
index 3c8f51f..8687542 100644
--- a/education/software development/ECE1400/C.md	
+++ b/education/software development/ECE1400/C.md	
@@ -30,4 +30,13 @@ A variable must be declared before it is assigned.
 | Specifier | Function                                                                                                                                 |
 | --------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
 | `%d`      | Display an integer                                                                                                                       |
-| `%f`      | Display a float. Specify the number of places to round to by adding a decimal and a number, eg `%.2f` would round to two decimal places. |
\ No newline at end of file
+| `%f`      | Display a float. Specify the number of places to round to by adding a decimal and a number, eg `%.2f` would round to two decimal places. |
+For number formatting specifiers, the convention is as follows:
+`%-a.bX`
+`%`: Start of the formatting specifier
+`-`: (optional) If included, justify value left in space. Otherwise, justify right in space
+`a`: (optional) If included, the size of the field in characters.
+`.`: Separator between `a` and `b`. Optional if `b` is not specified
+`b`: The number of decimal places to round to
+`X`: The type of format to use, and the end of the specifier. Use `d` for integer base 10 (decimal) representation, `f` for fixed point decimal, and `e` for exponential notation
+# Standard library
\ No newline at end of file
diff --git a/education/software development/ECE1400/Chapter 3 Exercises.md b/education/software development/ECE1400/Chapter 3 Exercises.md
index 474cbaa..a1031e5 100644
--- a/education/software development/ECE1400/Chapter 3 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 3 Exercises.md	
@@ -8,12 +8,13 @@ d. `1e-06 `
 ```c
 float x = 0.12345;
 // a
-printf("%-8.1f", x);
+printf("%-8.1e", x);
 // b
-printf("%10.6f", x);
+printf("%10.6e", x);
 // c
 printf("%8.3f", x);
 // d
-printf("%-6.0g", x);
+printf("%-6.0f", x);
 ```
-c. 
\ No newline at end of file
+
+# 3.