pointers exercises done

exercises/041_pointers3.zig

@@ -31,7 +31,7 @@ pub fn main() void {
 
     // Please define pointer "p" so that it can point to EITHER foo or
     // bar AND change the value it points to!
-    ??? p: ??? = undefined;
+    var p: *u8 = undefined;
 
     p = &foo;
     p.* += 1;

exercises/042_pointers4.zig

@@ -37,5 +37,5 @@ pub fn main() void {
 // This function should take a reference to a u8 value and set it
 // to 5.
 fn makeFive(x: *u8) void {
-    ??? = 5; // fix me!
+    x.* = 5; // fix me!
 }

exercises/043_pointers5.zig

@@ -68,7 +68,7 @@ pub fn main() void {
 
     // FIX ME!
     // Please pass Glorp to printCharacter():
-    printCharacter(???);
+    printCharacter(&glorp);
 }
 
 // Note how this function's "c" parameter is a pointer to a Character struct.

exercises/044_quiz5.zig

@@ -18,12 +18,14 @@ const Elephant = struct {
 
 pub fn main() void {
     var elephantA = Elephant{ .letter = 'A' };
+    var elephantB = Elephant{ .letter = 'B' };
     // (Please add Elephant B here!)
     var elephantC = Elephant{ .letter = 'C' };
 
     // Link the elephants so that each tail "points" to the next elephant.
     // They make a circle: A->B->C->A...
     elephantA.tail = &elephantB;
+    elephantB.tail = &elephantC;
     // (Please link Elephant B's tail to Elephant C here!)
     elephantC.tail = &elephantA;