Add solutions to exercises in C++ Primer (5th edition)

After thinking for a while, I finally decide to add my own solutions to
the exercises in the fifth edition of C++ Primer into this repo.

I didn't add those codes in the past (although I have been working on
this book for quite a while) because I am not confident about my own
work. I am afraid that some people might googling into this repo and
take these guesswork as some sample solutions. As a beginner, my
knowledge of the programming language is very limited, and my solutions
to the exercises might be hopelessly wrong.

The codes I put here definately have nothing to do with "standard
solutions," no... These are just something I write for practices (and
for fun). They are very personal. Sometime I won't even follow the
direction, but do something in my own way. I put them here mostly as
notes for my study, but it is also great if you find the codes helpful.

Solutions-to-Books/C++Primer/Chapter1/1.1.cpp

@@ -0,0 +1,3 @@
+int main(){
+    return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.10.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+
+int main() {
+	int num = 10;
+	while (num >= 0) {
+		std::cout << num << std::endl;
+		--num;
+	}
+
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.11.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+
+int main() {
+	int bound1 = 0, bound2 = 0;
+	std::cout << "Input two integers:" << std::endl;
+	std::cin >> bound1 >> bound2;
+
+	if (bound1 > bound2) {
+		int temp = bound1;
+		bound1 = bound2;
+		bound2 = temp;
+	}
+
+	while (bound1 <= bound2) {
+		std::cout << bound1 << std::endl;
+		++bound1;
+	}
+
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.13.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+
+int main() {
+	std::cout << "-----Exercise 1.9-----" << std::endl;
+	int sum = 0;
+	for (int val = 50; val <= 100; ++val)
+		sum += val;
+	std::cout << "The sum of 50 to 100 inclusive is "
+		<< sum << "\n" << std::endl;
+
+	std::cout << "-----Exercise 1.10-----" << std::endl;
+	for (int val = 10; val >= 0; --val)
+		std::cout << val << std::endl;
+
+	std::cout << "-----Exercise 1.11-----" << std::endl;
+	int bound1 = 0, bound2 = 0;
+	std::cout << "\n" << "Input two integers:" << std::endl;
+	std::cin >> bound1 >> bound2;
+	std::cout << "\n" << std::endl;
+
+	if (bound1 > bound2) {
+		int temp = bound1;
+		bound1 = bound2;
+		bound2 = temp;
+	}
+
+	for (int i = bound1; i <= bound2; ++i)
+		std::cout << i << std::endl;
+
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.16.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+
+int main() {
+	int sum = 0, val = 0;
+	std::cout << "Input a list of numbers:" << std::endl;
+	while (std::cin >> val)
+		sum += val;
+	std::cout << "The sum of all numbers = " << sum << std::endl;
+
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.18.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+int main() {
+	// currVal is the number we're counting; we'll read new values into val
+	int currVal = 0, val = 0;
+	// read first number and ensure that we have data to process
+	if (std::cin >> currVal) {
+		int cnt = 1;		// store the count for the current value we're processing
+		while (std::cin >> val) {	// read the remaining numbers
+			if (val == currVal)		// if the values are the same
+				++cnt;				// add 1 to cnt
+			else {	// otherwise, print the count for the previous value
+				std::cout << currVal << " occurs "
+					<< cnt << " times" << std::endl;
+				currVal = val;		// remember the new value
+				cnt = 1;			// reset the counter
+			}
+		}	// while loop ends here
+		// remembre to print the count for the last value in the file
+		std::cout << currVal << " occurs "
+			<< cnt << " times" << std::endl;
+	} // outermost if statement ends here
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.20.cpp

@@ -0,0 +1,10 @@
+#include <iostream>
+#include "Sales_item.h"
+
+int main() {
+	Sales_item book;
+	std::cout << "Enter a set of book sales transactions: " << std::endl;
+	while (std::cin >> book)
+		std::cout << book << std::endl;
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.21.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+#include "Sales_item.h"
+
+int main() {
+	Sales_item book1, book2;
+	std::cout << "Enter two books with same ISBN:" << std::endl;
+	std::cin >> book1 >> book2;
+	std::cout << book1 + book2 << std::endl;
+
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.3.cpp

@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+	std::cout << "Hello, World" << std::endl;
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.5.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+int main() {
+	std::cout << "Enter two numbers:";
+	std::cout << std::endl;
+	int v1 = 0, v2 = 0;
+	std::cin >> v1;
+	std::cin >> v2;
+	std::cout << "The product of ";
+	std::cout << v1;
+	std::cout << " and ";
+	std::cout << v2;
+	std::cout << " is ";
+	std::cout << v1 * v2;
+	std::cout << std::endl;
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.8.cpp

@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+	std::cout << /* "*/" /* " /* " */;
+	return 0;
+}

Solutions-to-Books/C++Primer/Chapter1/1.9.cpp

@@ -0,0 +1,13 @@
+#include <iostream>
+
+int main() {
+	int sum = 0, val = 50;
+	while (val <= 100) {
+		sum += val;
+		++val;
+	}
+	std::cout << "The sum of 50 to 100 inclusive is "
+		<< sum << std::endl;
+
+	return 0;
+}