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Author: Psingh12354

Pair.cpp

@@ -0,0 +1,49 @@
+/*
+Pair in STL c++
+pair<ti,t2> pair1;
+eg: 
+pair<string, int>p1
+*/
+#include<iostream>
+using namespace std;
+class student{
+	private:
+		string name;
+		int age;
+		public:
+			void setStudent(string s,int a)
+			{
+				name=s;
+				age=a;
+			}
+			void showStudent()
+			{
+				cout<<"\nName : "<<name;
+				cout<<"\nAge : "<<age;
+			}
+};
+int main()
+{
+	pair <string,int>p1;
+	pair <string,string>p2;
+	pair <string,float>p3;
+	pair <int,student>p4; // class student
+	// to insert a value in pair
+	p1=make_pair("Priyanshu",16);
+	p2=make_pair("India","New delhi");
+	p3=make_pair("Drilling C++",345.5f);
+	student ob;
+	ob.setStudent("Priyanshu",20);
+	p4=make_pair(1,ob);
+	//cout<<p1.first ; to print first element
+	//cout<<p1.second; to print second element
+	cout<<"Pair 1 : "<<p1.first<<" "<<p1.second;
+	cout<<"\nPair 2 : "<<p2.first<<" "<<p2.second;
+	cout<<"\nPair 3 : "<<p3.first<<" "<<p3.second;
+	cout<<"\nPair 4 : "<<p4.first<<" ";
+	student ob1=p4.second;
+	ob1.showStudent();
+	
+
+}
+

Tuple.cpp

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+/*
+Tuple in c++
+tuple<t1,t2,t3> tuple1;
+tuple<string,int,int>t1;
+you need to include tuple
+*/
+#include<iostream>
+#include<tuple>
+using namespace std;
+int main()
+{
+	tuple <string,int,int>t1;
+	// to insert value call make_tuple
+	t1=make_tuple("Priyanshu",20,56);
+	cout<<"Name "<<"     "<<"Age"<<"  "<<"Marks "<<endl;
+	cout<<get<0>(t1)<<" "<<get<1>(t1)<<"   "<<get<2>(t1); // angular bracket show it position
+	
+}
+

Vector.cpp

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+/*
+Vector in c++
+Vector is a type of container
+It is used when we don't know how much data we enter we 
+don't know it support dynamic array(means have some capacity)
+Vecotor increase it size according to it requirement
+it increase the size according to multiply with 2
+means if two value inserted and inserting third will increment according to 4
+you need to include a vector
+to create a blank vecotr use this command
+vector <int>v1;
+*/
+#include<iostream>
+#include<vector>
+using namespace std;
+int main()
+{
+	// vector <int>v1;
+	// to initile it to the point use this command
+	vector <int>v1 { 10,20,30};
+	// while declaring initilization capacity will be  3
+	// it will not follow by default value 1
+	// now it will increment 3 than 6 so on
+	// to initilize it size
+
+	vector <char> v2(5);
+
+	// to initilize the value and also size
+	// here 5 is the size and 10 is the value
+
+	vector <int> v3(5,10);
+	vector <string> v4(3,"hello");
+	vector <int> v5;
+
+	// square bracket
+
+	cout<<v4[0]<<" "<<v4[1]<<" "<<v4[2]<<"\n";
+
+	// loop
+
+	for(int i=0;i<4;i++)
+	{
+		cout<<v1[i]<<" ";
+	}
+	cout<<endl;
+
+	// push_back to insert a value
+
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	v5.push_back(10);
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	v5.push_back(20);
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	v5.push_back(30);
+
+//	// you can see here capacity increase by multiple of 2
+
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	v5.push_back(30);
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+
+	// by loop
+
+	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+	for(int i=0;i<=9;i++)
+	{
+		v5.push_back(10*(i+1));
+	}
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	cout<<"Size : "<<v5.size()<<"\n";
+
+//	// pop_back to delete last value
+
+//	v1.pop_back();
+//	cout<<"After pop : "<<endl;
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	cout<<"Size : "<<v5.size()<<"\n";
+
+//	// size return number of element
+
+//	v1.pop_back();
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	v1.pop_back();
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	v1.pop_back();
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	v1.pop_back();
+//	cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//	cout<<"Size : "<<v5.size()<<"\n";
+
+// to print	
+
+for(int i=0;i<v5.size();i++)
+{
+	cout<<v5[i]<<" ";
+}
+cout<<endl;
+
+// to clear
+
+//v5.clear();
+//cout<<"Current Capacity : "<<v5.capacity()<<"\n";
+//cout<<"Total element : "<<v5.size()<<endl;
+
+// at to return index
+cout<<"Value at index 4 is : "<<v5.at(4)<<endl;
+
+// front and back
+
+cout<<"First value is : "<<v5.front()<<"\n";
+cout<<"Last value is : "<<v5.back()<<"\n";
+
+// to insert a value at mid use iterator 
+
+vector <int>:: iterator  it=v5.begin();
+v5.insert(it+3,35); // here it is beggining position +2 show 3 rd position ,35 is value we insert
+for(int i=0;i<v5.size();i++)
+{
+	cout<<v5[i]<<" ";
+}
+cout<<endl;
+}