feat : added I/O Streams

0xNILADRI · 0xNILADRI · commit a5557a2f85f5 · 2021-06-15T21:24:48.000+05:30
diff --git a/18.IO Streams/1_write_In_file.cpp b/18.IO Streams/1_write_In_file.cpp
@@ -0,0 +1,11 @@
+#include<fstream>
+#include<iostream>
+using namespace std;
+
+int main(){
+    ofstream ofs ("a.txt",ios::trunc);
+    ofs<<"John"<<endl;
+    ofs<<25<<endl;
+    ofs<<"cs";
+    ofs.close();
+}
diff --git a/18.IO Streams/2_read_a_file.cpp b/18.IO Streams/2_read_a_file.cpp
@@ -0,0 +1,21 @@
+#include<fstream>
+#include<iostream>
+using namespace std;
+
+int main(){
+    ifstream infile;
+    infile.open("a.txt");
+    if(!infile.is_open())
+        cout<<"Unable to open file"<<endl;
+    
+    string str,str2;
+    int x;
+
+    infile>>str>>x>>str2;
+    if(infile.eof()){
+        cout<<"end of file reached"<<endl;
+        infile.close();
+    }
+    cout<<"Name : "<<str<<endl<<"Roll No : "<<x<<endl<<"Branch : "<<str2<<endl;
+    return 0;
+}
diff --git a/18.IO Streams/3_serialization.cpp b/18.IO Streams/3_serialization.cpp
@@ -0,0 +1,46 @@
+#include<fstream>
+#include<iostream>
+using namespace std;
+
+class Student{
+    public:
+        string name, branch;
+        int rollNo;
+
+        // constructor
+        Student(string name= " ", int rollNo=0, string branch=" "){
+            this->name = name;
+            this->rollNo = rollNo;
+            this->branch = branch;
+        }
+
+        friend ofstream & operator<<(ofstream &ofs, Student &s);
+        friend ifstream & operator>>(ifstream &ifs, Student &s);
+};
+
+ofstream & operator<<(ofstream &ofs, Student &s){
+    cout<<"Name    : "<<s.name<<endl;
+    cout<<"Roll No : "<<s.rollNo<<endl;
+    cout<<"Branch  : "<<s.branch<<endl;
+    return ofs;
+}
+
+ifstream & operator>>(ifstream &ifs, Student &s){
+    ifs>>s.name>>s.rollNo>>s.branch;
+    return ifs;
+}
+
+int main(){
+    Student s1("Niladri Ghosh",17,"CS");
+    ifstream ifs("student.txt");
+    ifs>>s1;
+    ifs.close();
+
+    ofstream ofs("student.txt");
+    if(!ofs.is_open())
+        cout<<"Unable to open file"<<endl;
+    ofs<<s1;
+    ofs.close();
+
+    return 0;
+}
diff --git a/18.IO Streams/4_student_exercise.cpp b/18.IO Streams/4_student_exercise.cpp
@@ -0,0 +1,45 @@
+#include<iostream>
+#include<fstream>
+using namespace std;
+
+class Product{
+    public:
+        string name;
+        float price;
+        int quantity;
+
+        //constructor
+        Product(string name = " ",float price = 0, int quantity = 0){
+            this->name = name;
+            this->price = price;
+            this->quantity = quantity;
+        }
+
+        friend ifstream & operator>>(ifstream &ifs, Product &p);
+        friend ofstream & operator<<(ofstream &ofs, Product &p);
+};
+
+ifstream & operator>>(ifstream &ifs, Product &p){
+    ifs>>p.name>>p.price>>p.quantity;
+    return ifs;
+}
+
+ofstream & operator<<(ofstream &ofs, Product &p){
+    cout<<"Name     : "<<p.name<<endl;
+    cout<<"Price    : $"<<p.price<<endl;
+    cout<<"Quantity : "<<p.quantity<<endl;
+    return ofs;
+}
+
+int main(){
+    Product p1("Hennessey Cognac",399.99,60);
+    ifstream ifs("product.txt");
+    ifs>>p1;
+    ifs.close();
+
+    ofstream ofs("product.txt");
+    ofs<<p1;
+    ofs.close();
+
+    return 0;
+}
diff --git a/18.IO Streams/a.txt b/18.IO Streams/a.txt
@@ -0,0 +1,3 @@
+John
+25
+cs
diff --git a/18.IO Streams/product.txt b/18.IO Streams/product.txt
diff --git a/18.IO Streams/student.txt b/18.IO Streams/student.txt
