fixing typos and grammar

exercises/093_hello_c.zig

@@ -1,16 +1,16 @@
 //
 // When Andrew Kelley announced the idea of a new programming language
 // - namely Zig - in his blog on February 8, 2016, he also immediately
-// stated his ambitious goal: to replace the C language!
+// stated this ambitious goal: to replace the C language!
 //
 // In order to be able to achieve this goal at all, Zig should be
 // as compatible as possible with its "predecessor".
 // Only if it is possible to exchange individual modules in existing
-// C programs without having to use complicated wrappers,
+// C programs without having to use any complicated wrappers,
 // the undertaking has a chance of success.
 //
 // So it is not surprising that calling C functions and vice versa
-// is extremely "smooth".
+// is extremely smooth.
 //
 // To call C functions in Zig, you only need to specify the library
 // that contains said function. For this purpose there is a built-in

exercises/096_memory_allocation.zig

@@ -31,7 +31,7 @@
 //     }
 
 // Instead of a simple integer or a constant sized slice, this
-// program requires a slice to be allocated that is the same size as
+// program requires a slice to be allocated so that is the same size as
 // an input array.
 
 // Given a series of numbers, take the running average. In other

exercises/097_bit_manipulation.zig

@@ -1,5 +1,5 @@
 //
-// Bit manipulations is a very powerful tool just also from Zig.
+// Bit manipulation is a very powerful tool that Zig also supports.
 // Since the dawn of the computer age, numerous algorithms have been
 // developed that solve tasks solely by moving, setting, or logically
 // combining bits.
@@ -8,9 +8,9 @@
 // functions where possible. And it is often possible with calculations
 // based on integers.
 //
-// Often it is not easy to understand at first glance what exactly these
+// Often it is not easy to understand at first glance exactly what these
 // algorithms do when only "numbers" in memory areas change outwardly.
-// But it must never be forgotten that the numbers only represent the
+// But it cannot be forgotten that the numbers only represent the
 // interpretation of the bit sequences.
 //
 // Quasi the reversed case we have otherwise, namely that we represent
@@ -35,8 +35,8 @@
 //          const res5 = numOne ^ numTwo; //   =  1111 1010 - xor
 //
 //
-// To familiarize ourselves with bit manipulation, we start with a simple
-// but often underestimated function and then add other exercises in
+// To familiarize ourselves with bit manipulation, let's start with a simple
+// but often underestimated function and then add other exercises in a
 // loose order.
 //
 // The following text contains excerpts from Wikipedia.
@@ -63,8 +63,8 @@
 //                        y := temp
 //
 // However, with integers we can also achieve the swap function simply by
-// bit manipulation. To do this, the variables are mutually linked with xor
-// and the result is the same.
+// using bit manipulation. To do this, the variables are mutually linked with 
+// xor and the result is the same.
 
 const std = @import("std");
 const print = std.debug.print;

exercises/098_bit_manipulation2.zig

@@ -1,5 +1,5 @@
 //
-// Another useful practice for bit manipulation is setting bits as flags.
+// Another useful application for bit manipulation is setting bits as flags.
 // This is especially useful when processing lists of something and storing
 // the states of the entries, e.g. a list of numbers and for each prime
 // number a flag is set.
@@ -19,12 +19,12 @@
 // For example, you could take an array of bool and set the value to 'true'
 // for each letter in the order of the alphabet (a=0; b=1; etc.) found in
 // the sentence. However, this is neither memory efficient nor particularly
-// fast. Instead we take a simpler way, very similar in principle, we define
-// a variable with at least 26 bits (e.g. u32) and also set the bit for each
-// letter found at the corresponding position.
+// fast. Instead we can take a simpler path, one that is
+// very similar in principle. We define a variable with at least 26 bits (e.g. u32) \
+// and also set the bit for each letter found at the corresponding position.
 //
-// Zig provides functions for this in the standard library, but we prefer to
-// solve it without these extras, after all we want to learn something.
+// Zig provides functions for this in the standard library, but we should
+// solve it without these extras; After all we want to learn something.
 //
 const std = @import("std");
 const ascii = std.ascii;

exercises/099_formatting.zig

@@ -19,9 +19,9 @@
 //     https://github.com/ziglang/zig/blob/master/lib/std/fmt.zig#L29
 //
 // Zig already has a very nice selection of formatting options.
-// These can be used in different ways, but typically to convert
-// numerical values into various text representations. The
-// results can be used for direct output to a terminal or stored
+// These can be used in different ways, but they are typically used
+// to convert numerical values into various text representations.
+// The results can be used for direct output to a terminal or stored
 // for later use or written to a file. The latter is useful when
 // large amounts of data are to be processed by other programs.
 //

exercises/100_for4.zig

@@ -1,13 +1,13 @@
 //
-// We've seen that the 'for' loop can let us perform some action
+// We've seen that the 'for' loop can let us perform an action
 // for every item in an array or slice.
 //
 // More recently, we discovered that it supports ranges to
 // iterate over number sequences.
 //
 // This is part of a more general capability of the `for` loop:
-// looping over one or more "objects" where an object is an
-// array, slice, or range.
+// looping over one or more "objects" where an object is defined as 
+// an array, slice, or range.
 //
 // In fact, we *did* use multiple objects way back in Exercise
 // 016 where we iterated over an array and also a numeric index.

exercises/102_testing.zig

@@ -1,12 +1,12 @@
 //
 // A big advantage of Zig is the integration of its own test system.
 // This allows the philosophy of Test Driven Development (TDD) to be
-// implemented perfectly. Zig even goes one step further than other
-// languages, the tests can be included directly in the source file.
+// implemented easily. Zig even goes one step further than other
+// languages, in that the tests can be included directly in the source file.
 //
 // This has several advantages. On the one hand it is much clearer to
-// have everything in one file, both the source code and the associated
-// test code. On the other hand, it is much easier for third parties
+// have both the source code and the associated test code in one file.
+// On the other hand, it is much easier for third parties
 // to understand what exactly a function is supposed to do if they can
 // simply look at the test inside the source and compare both.
 //
@@ -16,7 +16,7 @@
 // illustrate it with a small example including a test.
 //
 // Therefore, in this exercise we will deal with the basics of testing
-// in Zig. Basically, tests work as follows: you pass certain parameters
+// in Zig. Tests work as follows: you pass certain parameters
 // to a function, for which you get a return - the result. This is then
 // compared with the EXPECTED value. If both values match, the test is
 // passed, otherwise an error message is displayed.

exercises/103_tokenization.zig

@@ -1,20 +1,21 @@
 //
 // The functionality of the standard library is becoming increasingly
-// important in Zig. First of all, it is helpful to take a look at how
+// important to Zig. First of all, it is helpful to take a look at how
 // the individual functions are implemented. Because this is wonderfully
 // suitable as a template for your own functions. In addition these
-// standard functions are part of the basic configuration of Zig.
+// standard functions are part of the basic configuration and capabilities
+// of Zig.
 //
 // This means that they are always available on every system.
 // Therefore it is worthwhile to deal with them also in Ziglings.
-// It's a great way to learn important skills. For example, it is
+// It's also a great way to learn important skills. For example, it's
 // often necessary to process large amounts of data from files.
 // And for this sequential reading and processing, Zig provides some
 // useful functions, which we will take a closer look at in the coming
 // exercises.
 //
 // A nice example of this has been published on the Zig homepage,
-// replacing the somewhat dusty 'Hello world!
+// replacing the somewhat dusty 'Hello world!'
 //
 // Nothing against 'Hello world!', but it just doesn't do justice
 // to the elegance of Zig and that's a pity, if someone takes a short,

exercises/104_threading.zig

@@ -4,8 +4,8 @@
 // one possibility, namely asynchronous processes, in Exercises 84-91.
 //
 // However, the computing power of the processor is only distributed to
-// the started tasks, which always reaches its limits when pure computing
-// power is called up.
+// the started and running tasks, which always reaches its limits when
+// pure computing power is called up.
 //
 // For example, in blockchains based on proof of work, the miners have
 // to find a nonce for a certain character string so that the first m bits

exercises/105_threading2.zig

@@ -1,6 +1,6 @@
 //
-// Now that we are familiar with the principles of multi threading, we
-// boldly venture into a practical example from mathematics.
+// Now that we are familiar with the principles of multi-threading, we
+// shall boldly venture into a practical example from mathematics.
 // We will determine the circle number PI with sufficient accuracy.
 //
 // There are different methods for this, and some of them are several