Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,7 +1,19 @@
 # Quick style guide
 
-* Braces on a new line
-* Macros and return types on a separate line from the function definition:
+* Put braces on a new line
+* Float literals should have digits both before and after the decimal.
+  ```cpp
+  // Good
+  0.0f;
+  0.5f;
+  1.0f;
+  3.14159f;
+  
+  // Bad
+  1.f
+  .0f
+  ```
+* Put macros and return types on a separate line from the function definition:
   ```cpp
   HINLINE float
   HMM_MyFunction()
@@ -18,7 +30,7 @@
       hmm_vec3 MyVector = {0};
   }
   ```
-* Parentheses around the returned value:
+* Put parentheses around the returned value:
   ```cpp
   HINLINE float
   HMM_MyFunction()
@@ -33,7 +45,7 @@
 * If a new function is defined with different names for different datatypes, also add C++ overloaded versions of the functions. For example, if you have `HMM_LengthVec2(hmm_vec2)` and `HMM_LengthVec3(hmm_vec3)`, also provide `HMM_Length(hmm_vec2)` and `HMM_Length(hmm_vec3)`.
 
   It is fine for the overloaded versions to call the C versions.
-* Only use operator overloading for operations already built into C. That means no using `^` for cross product or `|` for dot product.
+* Only use operator overloading for analogous operators in C. That means `+` for vector addition is fine, but no using `^` for cross product or `|` for dot product.
 * Try to define functions in the same order as the prototypes.
 * Don't forget that Handmade Math uses column-major order for matrices!