Text File handling

Constructor/Untitled1.cpp

@@ -0,0 +1,35 @@
+#include<iostream>
+using namespace std;
+class area_circle{
+		int r,area;
+	public:
+		void read_data(){
+			cin>>r;
+		}
+
+		void publish_data()
+		{
+			cout<<area;
+		}
+};
+
+
+class volume:public area_circle
+{
+	int x;
+	public:
+		void get_data(){
+		}
+		void show_data(){
+
+		}
+};
+
+int main(){
+	volume B;
+	B.get_data();
+	B.show_data();
+	B.read_data();
+	B.publish_data();
+	return 0;
+}

Constructor/constructor-1.cpp

@@ -0,0 +1,30 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+class student{
+	private:
+		int roll;
+		char name[30];
+
+	public:
+		student(int x, char y[])    // parameterized constructor function
+		{
+		  roll= x;
+		  strcpy(name,y)	;
+		}
+		void show_data(){
+		    cout<<"\n Roll no :"<<roll;
+    		cout<<"\n Name    :"<<name;
+		}
+};
+
+int main(){
+	//student s;     // constructor function runs at the time of object creation
+
+	student s(10,"Manan");   // implicit call
+
+	student s1 = student(20,"Ramji");   // explicit call
+	s.show_data();
+	s1.show_data();
+	return 0;
+}

Constructor/contructir-with-default-values.cpp

@@ -0,0 +1,27 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+class student{
+	private:
+		int roll;
+		char name[30];
+
+	public:
+		student(int x=10, char y[]="Sumit Singh")    // parameterized constructor with default values
+		{
+		  roll= x;
+		  strcpy(name,y)	;
+		}
+		void show_data(){
+		    cout<<"\n Roll no :"<<roll;
+    		cout<<"\n Name    :"<<name;
+		}
+};
+
+int main(){
+
+	//student s;     // constructor function runs at the time of object creation
+	student s(30,"Hitesg");
+	s.show_data();
+	return 0;
+}

Constructor/destructir-1.cpp

@@ -0,0 +1,22 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+class student{
+	public:
+	student(){
+		cout<<"\n I am constructor"		;
+		}
+	~student(){
+		cout<<"\n Inside destrctor";
+	}
+};
+
+int main(){
+
+	student s;
+	 {
+	 	student s1;
+	 }
+	 student s2;
+	return 0;
+}

Constructor/overloading.cpp

@@ -0,0 +1,34 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+class student{
+	private:
+		int roll;
+		char name[30];
+
+	public:
+
+		student(){
+			roll=20;
+			strcpy(name,"Rakesh");
+		}
+
+		student(int x, char y[])    // parameterized constructor with default values
+		{
+		  roll= x;
+		  strcpy(name,y)	;
+		}
+
+		void show_data(){
+		    cout<<"\n Roll no :"<<roll;
+    		cout<<"\n Name    :"<<name;
+		}
+};
+
+int main(){
+
+	//student s;     // constructor function runs at the time of object creation
+	student s(40,"rajesh mandal");
+	s.show_data();
+	return 0;
+}

File_handling/demo.txt

@@ -0,0 +1,3 @@
+How to learn and then earn using C++
+This is my second line of text
+ This is third line having 	 tab and another spacing chars

File_handling/file_handling-1.cpp

@@ -0,0 +1,12 @@
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ofstream handa;
+	handa.open("demo.txt");
+	handa<<"How to learn and then earn using C++";
+	handa<<"\nThis is my second line of text";
+	handa<<"\n This is third line having \t tab and another spacing chars";
+	handa.close();
+	return 0;
+}

File_handling/file_read_1.cpp

@@ -0,0 +1,12 @@
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream object;
+	char name[300];
+	object.open("demo.txt");
+	object>>name;   // read one word at a time
+	cout<<"\n Entered Name :"<<name;
+	object.close();
+	return 0;
+}

File_handling/file_read_2.cpp

@@ -0,0 +1,12 @@
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream object;
+	char name[300];
+	object.open("demo.txt");
+	object.getline(name,300);
+	cout<<"\n Entered Value :"<<name;
+	object.close();
+	return 0;
+}

File_handling/file_read_3.cpp

@@ -0,0 +1,18 @@
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream object;
+	char name[300];
+	object.open("demo.txt");
+
+	object.getline(name,300);
+	cout<<"\n Entered Value :"<<name;
+	object.getline(name,300);
+	cout<<"\n Entered Value :"<<name;
+	object.getline(name,300);
+	cout<<"\n Entered Value :"<<name;
+
+	object.close();
+	return 0;
+}

File_handling/file_read_char_eof.cpp

@@ -0,0 +1,20 @@
+// file read char wise + EOF function
+
+
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream object;
+	char ch;
+	object.open("file_read_eof.cpp");
+
+	while(!object.eof())
+	   {
+	   	 object.get(ch);
+	   	 cout<<ch;
+	   }
+
+	object.close();
+	return 0;
+}

File_handling/file_read_eof.cpp

@@ -0,0 +1,20 @@
+// file read and using EOF function
+
+
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream object;
+	char name[300];
+	object.open("demo.txt");
+
+	while(!object.eof())
+	   {
+	   	 object.getline(name,300);
+	   	 cout<<name;
+	   }
+
+	object.close();
+	return 0;
+}

File_handling/file_read_eof_simulta.cpp

@@ -0,0 +1,18 @@
+// file read char wise + EOF function
+
+
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream object;
+	char ch;
+	object.open("file_read_eof.cpp");
+
+	while( object.get(ch))  // checking end of file using file object
+	    cout<<ch;
+
+
+	object.close();
+	return 0;
+}

File_handling/file_read_eof_using_object.cpp

@@ -0,0 +1,20 @@
+// file read char wise + EOF function
+
+
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream object;
+	char ch;
+	object.open("file_read_eof.cpp");
+
+	while(object)  // checking end of file using file object
+	   {
+	   	 object.get(ch);
+	   	 cout<<ch;
+	   }
+
+	object.close();
+	return 0;
+}

File_handling/total_words.cpp

@@ -0,0 +1,17 @@
+// program to find out total no of words in a text file
+#include<fstream>
+#include<iostream>
+using namespace std;
+int main(){
+	ifstream fin;
+	fin.open("demo.txt");
+	char word[100];
+	int count=0;
+	while(fin){
+		fin>>word;
+		count++;
+	}
+	fin.close();
+	cout<<"\nTotal words :"<<count;
+	return 0;
+}

classes/initialize_class_variable_wrong.cpp

@@ -7,6 +7,11 @@ class student{
 		char name[30];
 
 	public:
+		student()    // constructor function
+		{
+		  roll= 10;
+		  strcpy(name,"manan")	;
+		}
 		void show_data(){
 		    cout<<"\n Roll no :"<<roll;
     		cout<<"\n Name    :"<<name;
@@ -15,7 +20,7 @@ class student{
 
 
 int main(){
-	student s;
+	student s;     // constructor function runs at the time of object creation
 	s.show_data();
 	return 0;
 }

inheritance/Untitled1.cpp

@@ -0,0 +1,35 @@
+#include<iostream>
+using namespace std;
+class area_circle{
+		int r,area;
+	public:
+		void read_data(){
+			cin>>r;
+		}
+
+		void publish_data()
+		{
+			cout<<area;
+		}
+};
+
+
+class volume:public area_circle   // using public 
+{
+	int x;
+	public:
+		void get_data(){
+		}
+		void show_data(){
+
+		}
+};
+
+int main(){
+	volume B;
+	B.get_data();
+	B.show_data();
+	B.read_data();
+	B.publish_data();
+	return 0;
+}

inheritance/Untitled4.cpp

@@ -0,0 +1,19 @@
+#include<iostream>
+using namespace std;
+class mukul
+{
+	private:
+		int a;
+	public:
+		int b;
+	protected:
+		int c;
+};
+
+int main(){
+	mukul obj;
+	obj.a=10;
+	obj.b=20;
+	obj.c=30;
+	return 0;
+}