Generated on 2022-10-06

Author: cpp-tutor

headers/04-scope.cpp

@@ -6,12 +6,12 @@ using namespace std;
 int alice_height_m;
 
 void victorian_england() {
-    size_t alice_height_m{1};
+    size_t alice_height_m{ 1 };
     cout << "In \"victorian_england()\", alice_height_m is " << alice_height_m << ".\n";
 }
 
 void wonderland() {
-    double alice_height_m{0.15};
+    double alice_height_m{ 0.15 };
     cout << "In \"wonderland()\", alice_height_m is " << alice_height_m << ".\n";
 }
 

headers/05-pointer.cpp

@@ -5,11 +5,11 @@ using namespace std;
 
 int main() {
     int i{ -1 }, j{};
-    int *p;
-    p = &i; // set p to address of i
+    int *p;          // define p as an int*
+    p = &i;          // set p to address of i
     cout << "(1) p = " << p << ", *p = " << *p << ", i = " << i << '\n';
     cout << "Please enter an integer: ";
     cin >> j;
-    *p = j; // assign the value of j to the variable p points to
+    *p = j;          // assign the value of j to the variable p points to
     cout << "(2) p = " << p << ", *p = " << *p << ", i = " << i << '\n';
 }

headers/06-point1.cpp

@@ -4,26 +4,26 @@
 using namespace std;
 
 struct Point {
-	void setX(int nx) {
-	    x = nx;
-	}
-	void setY(int ny) {
-	    y = ny;
-	}
-	auto getXY() const {
-	    return pair{x, y};
-	}
+    void setX(int nx) {
+        x = nx;
+    }
+    void setY(int ny) {
+        y = ny;
+    }
+    auto getXY() const {
+        return pair{x, y};
+    }
 private:
-	int x{}, y{};
+    int x{}, y{};
 };
 
 int main() {
-	Point p;
-	int user_x{}, user_y{};
-	cout << "Please enter x and y for Point:\n";
-	cin >> user_x >> user_y;
-	p.setX(user_x);
-	p.setY(user_y);
-	auto [ px, py ] = p.getXY();
-	cout << "px = " << px << ", py = " << py << '\n';
+    Point p;
+    int user_x{}, user_y{};
+    cout << "Please enter x and y for Point:\n";
+    cin >> user_x >> user_y;
+    p.setX(user_x);
+    p.setY(user_y);
+    auto [ px, py ] = p.getXY();
+    cout << "px = " << px << ", py = " << py << '\n';
 }

headers/06-point2.cpp

@@ -4,46 +4,46 @@
 using namespace std;
 
 struct Point {
-	void setX(int nx)
-	{
-		if (nx < 0) {
-			x = 0;
-		}
-		else if (nx > screenX) {
-			x = screenX;
-		}
-		else {
-			x = nx;
-		}
-	}
-	void setY(int ny)
-	{
-		if (ny < 0) {
-			y = 0;
-		}
-		else if (ny > screenY) {
-			y = screenY;
-		}
-		else {
-			y = ny;
-		}
-	}
-	auto getXY() const {
-	    return pair{x, y};
+    void setX(int nx)
+    {
+        if (nx < 0) {
+            x = 0;
+        }
+        else if (nx > screenX) {
+            x = screenX;
+        }
+        else {
+            x = nx;
+        }
     }
-	static const int screenX{ 639 }, screenY{ 479 };
+    void setY(int ny)
+    {
+        if (ny < 0) {
+            y = 0;
+        }
+        else if (ny > screenY) {
+            y = screenY;
+        }
+        else {
+            y = ny;
+        }
+    }
+    auto getXY() const {
+        return pair{x, y};
+    }
+    static const int screenX{ 639 }, screenY{ 479 };
 private:
-	int x{}, y{};
+    int x{}, y{};
 };
 
 int main() {
-	cout << "Screen is " << Point::screenX + 1 << " by " << Point::screenY + 1 << '\n';
-	Point p;
-	int user_x{}, user_y{};
-	cout << "Please enter x and y for Point:\n";
-	cin >> user_x >> user_y;
-	p.setX(user_x);
-	p.setY(user_y);
-	auto [ px, py ] = p.getXY();
-	cout << "px = " << px << ", py = " << py << '\n';
+    cout << "Screen is " << Point::screenX + 1 << " by " << Point::screenY + 1 << '\n';
+    Point p;
+    int user_x{}, user_y{};
+    cout << "Please enter x and y for Point:\n";
+    cin >> user_x >> user_y;
+    p.setX(user_x);
+    p.setY(user_y);
+    auto [ px, py ] = p.getXY();
+    cout << "px = " << px << ", py = " << py << '\n';
 }

headers/06-point3.cpp

@@ -4,18 +4,18 @@
 using namespace std;
 
 struct Point{
-	int x{}, y{};
+    int x{}, y{};
 };
 
 Point operator+ (const Point& lhs, const Point& rhs) {
-	Point result;
-	result.x = lhs.x + rhs.x;
-	result.y = lhs.y + rhs.y;
-	return result;
+    Point result;
+    result.x = lhs.x + rhs.x;
+    result.y = lhs.y + rhs.y;
+    return result;
 }
 
 int main() {
-	Point p1{ 100, 200 }, p2{ 200, -50 }, p3;
-	p3 = p1 + p2;
-	cout << "p3 = (" << p3.x << ',' << p3.y << ")\n";
+    Point p1{ 100, 200 }, p2{ 200, -50 }, p3;
+    p3 = p1 + p2;           // use overloaded "operator+"
+    cout << "p3 = (" << p3.x << ',' << p3.y << ")\n";
 }

headers/06-point4.cpp

@@ -4,24 +4,23 @@
 using namespace std;
 
 struct Point{
-	int x{}, y{};
+    int x{}, y{};
 
-	Point& operator+= (const Point& rhs)
-	{
-		x += rhs.x;
-		y += rhs.y;
-		return *this;
-	}
+    Point& operator+= (const Point& rhs) { // member operator +=
+        x += rhs.x;
+        y += rhs.y;
+        return *this;
+    }
 };
 
-Point operator+ (const Point& lhs, const Point& rhs) {
-	Point result{ lhs };
-	result += rhs;
-	return result;
+Point operator+ (const Point& lhs, const Point& rhs) { // non-member operator+
+    Point result{ lhs };
+    result += rhs;
+    return result;
 }
 
 int main() {
-	Point p1{ 100, 200 }, p2{ 200, -50 }, p3;
-	p3 = p1 + p2;
-	cout << "p3 = (" << p3.x << ',' << p3.y << ")\n";
+    Point p1{ 100, 200 }, p2{ 200, -50 }, p3;
+    p3 = p1 + p2;
+    cout << "p3 = (" << p3.x << ',' << p3.y << ")\n";
 }

headers/07-lists.cpp

@@ -20,7 +20,7 @@ int main() {
         ++iter;                     // note: must "keep up"
     }
 
-    list<string> lst(begin(fwd), end(fwd));
+    list<string> lst(begin(fwd), end(fwd)); // copy fwd into lst
     lst.sort();
     for (const auto& e : lst) {
         cout << "- " << e << '\n';

headers/07-span.cpp

@@ -18,7 +18,7 @@ void print_ints(span<int> s) {
 int main() {
     int c_array[] = { 1, 2, 3 };
     vector vec = { 2, 6, 4, 3 };
-    array<int,4> std_array = { 3, 2, 1 };
+    array<int,4> std_array = { 7, 6, 5 };
 
     print_ints(c_array);
     print_ints(vec);

headers/07-string-upper.cpp

@@ -6,15 +6,15 @@
 using namespace std;
 
 void string_to_uppercase(string &s) {
-	for (auto& c : s) {
-		c = toupper(c);
-	}
+    for (auto& c : s) {
+        c = toupper(c);
+    }
 }
 
 int main() {
-	cout << "Please enter some text in lower-, mixed- or upper-case:\n";
-	string input;
-	getline(cin, input);
-	string_to_uppercase(input);
-	cout << "The same text in uppercase is:\n" << input << '\n';
+    cout << "Please enter some text in lower-, mixed- or upper-case:\n";
+    string input;
+    getline(cin, input);
+    string_to_uppercase(input);
+    cout << "The same text in uppercase is:\n" << input << '\n';
 }

headers/08-file1.cpp

@@ -12,7 +12,7 @@ int main(int argc, const char *argv[]) {
     ifstream infile{ argv[1] };
 
     int c = infile.get();
-    while (c != EOF) {
+    while (c != ifstream::traits_type::eof()) {
         cout << static_cast<char>(c);
         c = infile.get();
     }