Updating stuff and notes and everything

notes/3_08/demo.c

 #include <stdio.h>
 
-//char *s = "String 4";
+char *s = "String 4";
 
 char *strings[] = {
 	"String 1",

notes/3_10/const.cpp

+#include <iostream>
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+
+const int i = 7;
+
+cout << i << endl;
+
+*(int *) &i = 5;
+
+cout << i << endl;
+
+return 0;
+
+}

notes/3_10/hello.cpp

+#include <iostream>
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+	cout << "Hello World!" << endl;
+
+	return 0;
+}

notes/3_13/const.cpp

+#include <iostream>
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+
+volatile const int i = 7;
+
+cout << i << endl;
+
+*(int *) &i = 5;
+
+cout << i << endl;
+
+return 0;
+
+}

notes/3_13/string327.h

+#ifndef STRING327_H
+#define STRING327_H
+
+class string327 {
+  private:
+	char *str;
+  public:
+	string327();
+	string327(const char *s);
+	~string327();
+
+	int length();
+	const char *c_str();
+
+	int operator<(const string327 &s);
+	int operator>(const string327 &s);
+	int operator==(const string327 &s);
+	int operator!=(const string327 &s);
+	int operator<=(const string327 &s);
+	int operator>=(const string327 &s);
+
+	string327 operator+(const string327 &s);
+	string327 &operator+=(const string327 &s);
+	string327 &operator=(const string327 &s);
+	string327 &operator=(const char *s);
+
+	char &operator[](const int i);
+};
+
+#endif

notes/3_13/swap.cpp

+#include <iostream>
+
+using namespace std;
+
+void cswap(int *a, int *b) {
+	int tmp = *a;
+	*a = *b;
+	*b = tmp;
+}
+
+void cppswap(int &a, int &b) {
+	int tmp = a;
+	a = b;
+	b = tmp;
+}
+
+int main(int argc, char *argv[]) {
+	int i;
+	int &r = i;
+
+	r = 0;
+	cout << i << endl;
+	i = 10;
+	cout << r << endl;
+
+	int a = 10, b = 20;
+
+	cswap(&a, &b);
+
+	printf("a: %d, b: %d\n", a, b);
+
+	cppswap(a, b);
+
+	printf("a: %d, b: %d\n", a, b);
+
+	return 0;
+}

notes/3_15/string327.c

+#include <cstring>
+
+#include "string327.h"
+
+string327::string327() {
+	str = (char *) malloc(1);
+	str[0] = '\0';
+}
+
+string327::string327(const char *s) {
+	str = strdup(s);
+}
+
+string327::~string327() {
+	free(str);
+}
+
+int string327::length() {
+	return strlen(str);
+}
+
+const char *string327::c_str() {
+	return str;
+}
+
+int string327::operator<(const string327 &s) {
+	return strcmp(str, s.str) < 0;
+}
+
+int string327::operator>(const string327 &s) {
+	return strcmp(str, s.str) > 0;
+}
+
+int string327::operator==(const string327 &s) {
+	return strcmp(str, s.str) == 0;
+}
+
+int string327::operator!=(const string327 &s) {
+	return strcmp(str, s.str) != 0;
+}
+
+int string327::operator<=(const string327 &s) {
+	return strcmp(str, s.str) <= 0;
+}
+
+int string327::operator>=(const string327 &s) {
+	return strcmp(str, s.str) >= 0;
+}
+
+string327 string327::operator+(const string327 &s) {
+	string327 out;
+	free(out.str);
+	
+	out.str = malloc(strlen(str) + strlen(s.str) + 1);
+	strcpy(out.str, str);
+	strcat(out.str, s.str);
+	
+	return out;
+}
+
+string327 &string327::operator+=(const string327 &s) {
+	str = (char *) realloc(str, strlen(str) + strlen(s.str) + 1);
+	strcat(str, s.str);
+	
+	return *this;
+}
+
+string327 &string327::operator=(const string327 &s) {
+	free(str);
+	str = strdup(s.str);
+	
+	return *this;
+}
+
+string327 &string327::operator=(const char *s) {
+	free(str);
+	str = strcup(s);
+}
+
+char &string327::operator[](const int i) {
+	return str[i];
+}

notes/3_15/string327.h

+#ifndef STRING327_H
+#define STRING327_H
+
+class string327 {
+ private:
+	char *str;
+ public:
+	string327();
+	string327(const char *s);
+	~string327();
+
+	int length();
+	const char *c_str();
+
+	int operator<(const string327 &s);
+	int operator>(const string327 &s);
+	int operator==(const string327 &s);
+	int operator!=(const string327 &s);
+	int operator<=(const string327 &s);
+	int operator>=(const string327 &s);
+
+	string327 operator+(const string327 &s);
+	string327 &operator+=(const string327 &s);
+	string327 &operator=(const string327 &s);
+	string327 &operator=(const char *s);
+
+	char &operator[](const int i);
+};
+
+#endif

notes/3_15/strtest.cpp

+#include <iostream>
+
+#include "string327.h"