refactoring: added descriptions for division cases

src/arithmeticDivision.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 
 int* division_integer(int dividend, int divisor) {
+    // division with 0 would cause errors
     if(divisor == 0) {
         return NULL;
     }
@@ -17,6 +18,7 @@ int* division_integer(int dividend, int divisor) {
 }
 
 long* division_long(long dividend, long divisor) {
+    // division with 0 would cause errors
     if(divisor == 0) {
         return NULL;
     }
@@ -26,6 +28,7 @@ long* division_long(long dividend, long divisor) {
 }
 
 double* division_double(double dividend, double divisor) {
+    // division with 0 would cause errors
     if(divisor == 0) {
         return NULL;
     }
@@ -35,6 +38,7 @@ double* division_double(double dividend, double divisor) {
 }
 
 float* division_float(float dividend, float divisor) {
+    // division with 0 would cause errors
     if(divisor == 0) {
         return NULL;
     }