Added comments

Assignment 5/main.c

@@ -9,14 +9,14 @@
 
 int gcd (int p, int q)
 {
-	int r,t;
+	int r;
-    while (q > 0)
+    while (q > 0)   /* Loops until the remainder is 0 */
     {
-        r = p%q;
+        r = p%q; /* Calculate remainder */
-        p=q;
+        p=q;    /* Storing the value of q in p */
-        q=r;
+        q=r;    /* Setting q to the value of the remainder to calculate new remainder in the next iteration */
     }
-    return p;
+    return p;   /* Returning p after the loop finishes */
 }