lab 10: init

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

lab10/file.org

@@ -0,0 +1,164 @@
+* Write a program to read a text file and display its contents on the screen.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 28.cpp :wrap src text
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+const string FILE_PATH = "./28.in";
+
+int main() {
+  string line;
+
+  fstream file;
+  file.open(FILE_PATH, ios_base::in);
+
+  if (!file.is_open())
+    exit(1);
+
+  while (getline(file, line)) {
+    cout << line;
+    if (file.peek() != EOF) {
+      cout << endl;
+    }
+  }
+
+  file.close();
+
+  return 0;
+}
+#+end_src
+
+#+begin_src text
+Asperger syndrome (AS), also known as Asperger's, is a former neurodevelopmental disorder.
+It is characterized by significant difficulties in social interaction and nonverbal communication.
+#+end_src
+
+#+LATEX: \clearpage
+
+* Write a program to copy the contents of a file into another.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 29.cpp :wrap src text
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+const string SRC_FILE_PATH = "./29.in";
+const string DST_FILE_PATH = "./29.out";
+
+int main() {
+  string line;
+
+  fstream src, dst;
+  src.open(SRC_FILE_PATH, ios_base::in);
+  dst.open(DST_FILE_PATH, ios_base::out);
+  dst.close();
+  dst.open(DST_FILE_PATH, ios_base::app);
+
+  if (!src.is_open())
+    exit(1);
+
+  while (getline(src, line)) {
+    dst << line;
+    if (src.peek() != EOF) {
+      dst << endl;
+    }
+  }
+
+  src.close();
+  dst.close();
+
+  return 0;
+}
+#+end_src
+
+#+LATEX: \clearpage
+
+* Write a program to read the class object of student_info such as name , age ,sex ,height and weight from the keyboard and to store them on a specified file using read() and write() functions. Again the same file is opened for reading and displaying the contents of the file on the screen.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 30.cpp :wrap src text
+#include <fstream>
+#include <iostream>
+#include <ostream>
+
+using namespace std;
+const string FILE_PATH = "./30.out";
+
+class StudentInfo {
+  char name[30];
+  uint age;
+  char sex;
+  uint height;
+public:
+  void read();
+  void write();
+};
+
+void StudentInfo::read() {
+  cout << "Name: ";
+  cin >> name;
+  cout << "Age: ";
+  cin >> age;
+  cout << "Sex (m/f): ";
+  cin >> sex;
+  cout << "Height: ";
+  cin >> height;
+  cout << "[LOG] Data read\n";
+}
+
+void StudentInfo::write() {
+  ofstream file(FILE_PATH);
+  file.close();
+  file.open(FILE_PATH, ios_base::app);
+
+  file << "Name: " << name << endl
+       << "Age: " << age << endl
+       << "Sex: " << (sex == 'm' ? "Male" : "Female") << endl
+       << "Height: " << height << "cm";
+
+  cout << "[LOG] Data written\n";
+
+  file.close();
+}
+
+int main() {
+  StudentInfo foo;
+  string line;
+
+  foo.read();
+  foo.write();
+
+  ifstream file(FILE_PATH);
+
+  if (!file.is_open())
+    exit(1);
+
+  cout << "File contents: \n";
+  
+  while (getline(file, line)) {
+    cout << line;
+    if (file.peek() != EOF) {
+      cout << endl;
+    }
+  }
+
+  return 0;
+}
+#+end_src
+
+#+begin_src text
+Name: Hello
+Age: 19
+Sex (m/f): m
+Height: 180
+[LOG] Data read
+[LOG] Data written
+File contents: 
+Name: Hello
+Age: 19
+Sex: Male
+Height: 180cm
+#+end_src