check for dev1650 and some minor polish

exercises/026_hello2.zig

@@ -7,9 +7,9 @@ const std = @import("std");
 
 // Take note that this main() definition now returns "!void" rather
 // than just "void". Since there's no specific error type, this means
-// that Zig will infer the error type. This is appropriate in the
-// case of main(), but can make a function harder (function pointers)
-// or even impossible to work with (recursion) in some situations.
+// that Zig will infer the error type. This is appropriate in the case
+// of main(), but can make a function harder (function pointers) or
+// even impossible to work with (recursion) in some situations.
 //
 // You can find more information at:
 // https://ziglang.org/documentation/master/#Inferred-Error-Sets

exercises/093_hello_c.zig

@@ -53,8 +53,8 @@ pub fn main() void {
     // specify a file descriptor i.e. 2 for error console.
     //
     // In  this exercise we use 'write' to output 17 chars,
-    // but something is missing...
-    const c_res = ???write(2, "Hello C from Zig!", 17);
+    // but something is still missing...
+    const c_res = write(2, "Hello C from Zig!", 17);
 
     // let's see what the result from C is:
     std.debug.print(" - C result ist {d} chars written.\n", .{c_res});

exercises/094_c_math.zig

@@ -29,5 +29,6 @@ pub fn main() !void {
     // Here we call the C function 'fmod' to get our normalized angel.
     const result = c.fmod(angel, circle);
 
+    // We use formatters for the desired precision and to truncate the decimal places
     std.debug.print("The normalized angle of {d: >3.1} degrees is {d: >3.1} degrees.\n", .{ angel, result });
 }