5 files changed, 196 insertions, 0 deletions
diff --git a/7p56.cpp b/7p56.cpp
new file mode 100644
index 0000000..bdddef9
--- /dev/null
+++ b/7p56.cpp
@@ -0,0 +1,15 @@
+
+/*
+ *
+ * 7.56
+ *
+ *
+ */
+
+int main () {
+
+	// A static member is shared across all objects of the same Class type.
+	// This means that if we change the static member, all classes will be
+	// see this change on the static member.
+	return 0;
+}
diff --git a/7p57.cpp b/7p57.cpp
new file mode 100644
index 0000000..03be16f
--- /dev/null
+++ b/7p57.cpp
@@ -0,0 +1,39 @@
+#include <iostream>
+
+/*
+ *
+ * 7.57
+ *
+ *
+ */
+
+class Account {
+public:
+	Account(std::string o, double am): owner(o), amount(am) {}
+	Account(std::string o): Account(o, 0) {}
+	Account(): Account("John Doe", 0) {}
+	void calculate() { amount += amount * interestRate; }
+	static double rate() { return interestRate; }
+	static void rate(double);
+private:
+	std::string owner;
+	double amount;
+	static double interestRate;
+	static double initRate();
+};
+
+double Account::initRate() {
+
+	return 1;
+}
+
+double Account::interestRate = Account::initRate();
+
+int main () {
+
+	Account a1;
+	Account a2("Joe Johnsson");
+	Account a3("Manny Manson", 1000);
+	std::cout << Account::rate() << std::endl;
+	return 0;
+}
diff --git a/7p58.cpp b/7p58.cpp
new file mode 100644
index 0000000..ac94db8
--- /dev/null
+++ b/7p58.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+#include <vector>
+
+/*
+ *
+ * 7.58
+ *
+ *
+ */
+
+class Example {
+public:
+	static double rate; // Cannot be initialized here
+	static const int vecSize = 20;
+	static std::vector<double> vec; // Cannot be initialized here
+};
+
+// We initialize them here instead
+double Example::rate = 20;
+std::vector<double> Example::vec(vecSize);
+int main () {
+	
+	/*
+	  // example.h
+	  class Example {
+	  public:
+	  static double rate = 6.5;
+	  static const int vecSize = 20;
+	  static vector<double> vec(vecSize);
+	  };
+	  
+	  // example.C
+	  #include "example.h"
+	  double Example::rate;
+	  vector<double> Example::vec;
+	 */
+	return 0;
+}
diff --git a/class-tests-main.cpp b/class-tests-main.cpp
new file mode 100644
index 0000000..86a289e
--- /dev/null
+++ b/class-tests-main.cpp
@@ -0,0 +1,26 @@
+#include <iostream>
+#include "class-tests.hpp"
+
+/*
+ *
+ * 
+ *
+ *
+ */
+
+int main () {
+
+	CLASS_TESTS a;
+	a.Get_System_Info();
+	a.print_CT();
+	if(a.isFailed()) {
+		std::cout << "Fail." << std::endl;
+		return 1;
+	}
+	
+	if(a.isSuccess()) {
+		std::cout << "Success!" << std::endl;
+	}
+	
+	return 0;
+}
diff --git a/class-tests.hpp b/class-tests.hpp
new file mode 100644
index 0000000..8ac10a2
--- /dev/null
+++ b/class-tests.hpp
@@ -0,0 +1,78 @@
+/*
+  Made this file mainly to just play around with classes and play around with the features.
+  No real use for this code.
+ */
+#ifndef CLASS_TESTS_HPP
+#define CLASS_TESTS_HPP
+#include <iostream>
+#include <string>
+#include <vector>
+#include <sys/utsname.h>
+#include <time.h>
+
+struct ERROR_RESULT {
+	friend class CLASS_TESTS;
+private:
+	bool fail = false;
+	bool partial = false;
+	bool success = false;
+};
+
+class CLASS_TESTS {
+public:
+	CLASS_TESTS(): Kernel(""), Distro_OS(""), EnvVarHOME(""), TotalMemoryBytes(0), CurTime(0) { }
+	CLASS_TESTS(std::string K, std::string D, std::string H, size_t B, time_t T):
+		Kernel(K), Distro_OS(D), EnvVarHOME(H), TotalMemoryBytes(B), CurTime(T){ }
+	void print_CT();
+	ERROR_RESULT Get_System_Info();
+	ERROR_RESULT Get_Errors() { return res; };
+	bool isFailed() { return res.fail; }
+	bool isPartial() { return res.partial; }
+	bool isSuccess() { return res.success; }
+private:
+	std::string Kernel;
+	std::string Distro_OS;
+	std::string EnvVarHOME;
+	size_t TotalMemoryBytes;
+	time_t CurTime;
+	ERROR_RESULT res;
+};
+
+void CLASS_TESTS::print_CT() {
+	std::cout << Kernel << "\n"
+			  << Distro_OS << "\n"
+			  << EnvVarHOME << "\n"
+			  << TotalMemoryBytes << "\n"
+			  << CurTime << std::endl;
+}
+
+ERROR_RESULT CLASS_TESTS::Get_System_Info() {
+
+	struct utsname gsi;
+	if(uname(&gsi) == -1) {
+		res.fail = true;
+		return res;
+	}
+	
+	Kernel = gsi.sysname;
+	Distro_OS = gsi.release;
+	char *r = std::getenv("HOME");
+	if(r == NULL) {
+		res.fail = false;
+		res.partial = true;
+		return res;
+	}
+	
+	EnvVarHOME = r;
+	CurTime = time(NULL);
+	if(CurTime == -1) {
+		res.partial = true;
+	}
+
+	TotalMemoryBytes = 4096;
+	res.partial = false;
+	res.success = true;
+	return res;
+}
+
+#endif