diff --git a/Notes_Assignment/Structure.pptx b/Notes_Assignment/Structure.pptx
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diff --git a/string/array_string.cpp b/string/array_string.cpp
new file mode 100644
index 0000000..14cd252
--- /dev/null
+++ b/string/array_string.cpp
@@ -0,0 +1,17 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+int main(){
+	char name[5][30]={
+		"rakesh",
+		"amitABCD","sumitRSTV",
+		"anujIKLH",
+		"UditPPPSSah"
+	
+	};
+	
+	for(int i=0;i<5;i++)
+	   cout<<name[i][4]<<endl;
+	return 0;
+}
+
diff --git a/string/array_string.exe b/string/array_string.exe
new file mode 100644
index 0000000..25e68cc
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diff --git a/structure/array_structure.cpp b/structure/array_structure.cpp
new file mode 100644
index 0000000..42442b0
--- /dev/null
+++ b/structure/array_structure.cpp
@@ -0,0 +1,55 @@
+#include<iostream>
+using namespace std;
+struct student{
+	int roll;       //10
+	char name[30];  // anupam gulati 
+	int marks[3];   // 90,78,56
+	int total;
+	char grade;     
+};
+
+int main(){
+	student s[5];
+	int i;
+	for(i=0;i<5;i++)
+		{
+		cout<<"\n Enter roll no :";
+		cin>>s[i].roll;
+		cout<<"\n Enter name :";
+		fflush(stdin);
+		cin.getline(s[i].name,30);
+		cout<<"\n Enter marks obtained in first subject (100) :";
+		cin>>s[i].marks[0];
+		
+		cout<<"\n Enter marks obtained in Second subject (100) :";
+		cin>>s[i].marks[1];
+		
+		cout<<"\n Enter marks obtained in Third Subject (100) :";
+		cin>>s[i].marks[2];
+      }
+	//processing area
+	for(i=0;i<5;i++)
+	{
+	
+		s[i].total = s[i].marks[0]+s[i].marks[1]+s[i].marks[2];
+		
+		float per = s[i].total/3;
+		
+		if(per>=90)
+		    s[i].grade = 'A';
+		if(per<90 && per>=80)
+			s[i].grade='B';
+		if(per<80)
+			s[i].grade ='C';
+	}
+		
+//	// output phase
+	for(i=0;i<5;i++){
+	
+	cout<<"\n Roll No :"<<s[i].roll;
+	cout<<"\n Name    :"<<s[i].name;
+	cout<<"\n Grade   :"<<s[i].grade;
+	cout<<endl;
+	}
+	return 0;
+}
diff --git a/structure/call_by_ref.cpp b/structure/call_by_ref.cpp
new file mode 100644
index 0000000..13acc68
--- /dev/null
+++ b/structure/call_by_ref.cpp
@@ -0,0 +1,34 @@
+// call by reference method
+
+
+#include<iostream>
+#include<string.h>
+using namespace std;
+struct student{
+	int roll;
+	char name[30];
+	char fname[30];
+};
+
+void change_data(student &r){
+	r.roll= 10;
+	strcpy(r.name,"rakesh");
+	strcpy(r.fname,"sudarshan Sharma");
+}
+
+int main(){
+
+	student s={10,"Swapnil","R.K. Sharma"};
+	
+	cout<<"\n Roll :"<<s.roll;
+	cout<<"\n Name :"<<s.name;
+	cout<<"\n Father Name" <<s.fname;
+	
+	change_data(s);
+	
+	
+	cout<<"\n Roll :"<<s.roll;
+	cout<<"\n Name :"<<s.name;
+	cout<<"\n Father Name" <<s.fname;
+	return 0;
+}
diff --git a/structure/call_by_ref.exe b/structure/call_by_ref.exe
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index 0000000..0be5d6e
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diff --git a/structure/call_by_value.cpp b/structure/call_by_value.cpp
new file mode 100644
index 0000000..b424297
--- /dev/null
+++ b/structure/call_by_value.cpp
@@ -0,0 +1,34 @@
+// structure as a function parameter
+
+
+#include<iostream>
+#include<string.h>
+using namespace std;
+struct student{
+	int roll;
+	char name[30];
+	char fname[30];
+};
+
+void change_data(student r){
+	r.roll= 20;
+	strcpy(r.name,"rakesh");
+	strcpy(r.fname,"sudarshan Sharma");
+}
+
+int main(){
+	
+	student s={10,"Swapnil","R.K. Sharma"};
+	
+	cout<<"\n Roll :"<<s.roll;
+	cout<<"\n Name :"<<s.name;
+	cout<<"\n Father Name" <<s.fname;
+	
+	change_data(s);
+	
+	
+	cout<<"\n Roll :"<<s.roll;
+	cout<<"\n Name :"<<s.name;
+	cout<<"\n Father Name" <<s.fname;
+	return 0;
+}
diff --git a/structure/call_by_value.exe b/structure/call_by_value.exe
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index 0000000..6c56bd4
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diff --git a/structure/default_assignment.cpp b/structure/default_assignment.cpp
new file mode 100644
index 0000000..fd5cc89
--- /dev/null
+++ b/structure/default_assignment.cpp
@@ -0,0 +1,7 @@
+#include<iostream>
+using namespace std;
+int main(){
+	int x;
+	cout<<x;
+	return 0;
+}
diff --git a/structure/init-3.cpp b/structure/init-3.cpp
new file mode 100644
index 0000000..469666e
--- /dev/null
+++ b/structure/init-3.cpp
@@ -0,0 +1,25 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+	struct student{
+	int roll;
+	char name[30];
+	float fees;
+	char grade;
+	char std[10];
+};
+
+int main()
+{
+
+	student s;
+	// initialise structure variable
+	cin>>s.roll;
+	cin>>s.name;
+	cin>>s.fees;
+	cin>>s.grade;
+	
+	cout<<s.roll<<endl;
+	cout<<s.name<<endl;
+return 0;
+}
diff --git a/structure/initial-5.cpp b/structure/initial-5.cpp
new file mode 100644
index 0000000..953d7d2
--- /dev/null
+++ b/structure/initial-5.cpp
@@ -0,0 +1,27 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+	struct student{
+	int roll;
+	char name[30];
+	float fees;
+	char grade;
+	char std[10];
+};
+
+int main()
+{
+	student s={10,"saurabh sethi",2350.50,'B'}; 
+	student r;
+	
+	//requirement - Initial R using S only
+	//method -1
+	r.roll = s.roll;
+	strcpy(r.name , s.name);
+	r.fees = s.fees;
+	r.grade = s.grade;
+	
+	cout<<r.roll<<endl;
+	cout<<r.name<<endl;
+return 0;
+}
diff --git a/structure/initial-6.cpp b/structure/initial-6.cpp
new file mode 100644
index 0000000..139f623
--- /dev/null
+++ b/structure/initial-6.cpp
@@ -0,0 +1,25 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+	struct student{
+	int roll;
+	char name[30];
+	float fees;
+	char grade;
+	char std[10];
+};
+
+int main()
+{
+	student s={10,"saurabh sethi",2350.50,'B'}; 
+	student r;
+	
+	//requirement - Initial R using S only
+	//method -1
+	
+	r=s;
+	
+	cout<<"copied Roll :"<<r.roll<<endl;
+	cout<<"copied name : "<<r.name<<endl;
+return 0;
+}
diff --git a/structure/initialize-2.cpp b/structure/initialize-2.cpp
new file mode 100644
index 0000000..cec338d
--- /dev/null
+++ b/structure/initialize-2.cpp
@@ -0,0 +1,25 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+	struct student{
+	int roll;
+	char name[30];
+	float fees;
+	char grade;
+	char std[10];
+};
+
+int main()
+{
+
+	student s;
+	// initialise structure variable
+	s.roll=10;
+	strcpy(s.name,"saurabh");
+	s.fees = 1234.56;
+	s.grade='A';
+	
+	cout<<s.roll<<endl;
+	cout<<s.name<<endl;
+return 0;
+}
diff --git a/structure/nested_structure-1.cpp b/structure/nested_structure-1.cpp
new file mode 100644
index 0000000..fbb8430
--- /dev/null
+++ b/structure/nested_structure-1.cpp
@@ -0,0 +1,28 @@
+#include<iostream>
+using namespace std;
+struct address{
+	char houseNo[10];
+	char society[20];
+	char area[20];
+	char locality[30];
+	char city[20];
+	char state[20];
+	char country[100];
+};
+
+struct date{
+	int day;
+	int month;
+	int year;
+};
+struct student{
+	int 		roll;
+	char 		name[30];
+	address 	add;
+	date        dob;
+};
+int main(){
+	student s;
+	
+	return 0;
+}
diff --git a/structure/nested_structyre.cpp b/structure/nested_structyre.cpp
new file mode 100644
index 0000000..fbb8430
--- /dev/null
+++ b/structure/nested_structyre.cpp
@@ -0,0 +1,28 @@
+#include<iostream>
+using namespace std;
+struct address{
+	char houseNo[10];
+	char society[20];
+	char area[20];
+	char locality[30];
+	char city[20];
+	char state[20];
+	char country[100];
+};
+
+struct date{
+	int day;
+	int month;
+	int year;
+};
+struct student{
+	int 		roll;
+	char 		name[30];
+	address 	add;
+	date        dob;
+};
+int main(){
+	student s;
+	
+	return 0;
+}
diff --git a/structure/nested_structyre.exe b/structure/nested_structyre.exe
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index 0000000..c8b8be7
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diff --git a/structure/pass_structure-valid_method.cpp b/structure/pass_structure-valid_method.cpp
new file mode 100644
index 0000000..0888e4e
--- /dev/null
+++ b/structure/pass_structure-valid_method.cpp
@@ -0,0 +1,21 @@
+// structure as a function parameter
+
+
+#include<iostream>
+using namespace std;
+struct student{
+	int roll;
+	char name[30];
+	char fname[30];
+};
+void print_data(student r){
+	cout<<"\n Roll :"<<r.roll;
+	cout<<"\n Name :"<<r.name;
+	cout<<"\n Father Name" <<r.fname;
+}
+
+int main(){
+	student s={10,"Swapnil","R.K. Sharma"};
+	print_data(s);
+	return 0;
+}
diff --git a/structure/pass_structure-valid_method.exe b/structure/pass_structure-valid_method.exe
new file mode 100644
index 0000000..f1e960f
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diff --git a/structure/pass_structure.cpp b/structure/pass_structure.cpp
new file mode 100644
index 0000000..12ce51b
--- /dev/null
+++ b/structure/pass_structure.cpp
@@ -0,0 +1,27 @@
+#include<iostream>
+using namespace std;
+struct student{
+	int roll;
+	char name[30];
+	char fname[30];
+	char address[100];
+	char phone[15];
+	char email[80];
+	char website[100];
+	int mark[3];
+	int total;
+	char grade;
+	char std[10];
+	char session[20];
+	
+};
+void print_data(int x, char y[],char add[],char ph[]){
+	cout<<"\n Roll :"<<x;
+	cout<<"\n Name :"<<y;
+}
+
+int main(){
+	student s={10,"Swapnil"};
+	print_data(s.roll,s.name);
+	return 0;
+}
diff --git a/structure/pass_structure.exe b/structure/pass_structure.exe
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diff --git a/structure/simple_input_output.cpp b/structure/simple_input_output.cpp
new file mode 100644
index 0000000..b85d252
--- /dev/null
+++ b/structure/simple_input_output.cpp
@@ -0,0 +1,29 @@
+#include<iostream>
+using namespace std;
+struct student{
+	int roll;       //10
+	char name[30];  // anupam gulati 
+	int marks;      // 90
+	char grade;     // A
+};
+int main(){
+	student s;
+	cout<<"\n Enter roll no :";
+	cin>>s.roll;
+	cout<<"\n Enter name :";
+	fflush(stdin);
+	cin.getline(s.name,30);
+	cout<<"\n Enter marks (100) :";
+	cin>>s.marks;
+	cout<<"\n Enter grade :";
+	cin>>s.grade;
+	
+	// output phase
+	
+	cout<<"\n Roll No :"<<s.roll;
+	cout<<"\n Name    :"<<s.name;
+	cout<<"\n Marks   :"<<s.marks;
+	cout<<"\n Grade   :"<<s.grade;
+	
+	return 0;
+}
diff --git a/structure/stduent_record.cpp b/structure/stduent_record.cpp
new file mode 100644
index 0000000..7dca06c
--- /dev/null
+++ b/structure/stduent_record.cpp
@@ -0,0 +1,47 @@
+#include<iostream>
+using namespace std;
+struct student{
+	int roll;       //10
+	char name[30];  // anupam gulati 
+	int marks[3];   // 90,78,56
+	int total;
+	char grade;     
+};
+
+int main(){
+	student s;
+	
+	cout<<"\n Enter roll no :";
+	cin>>s.roll;
+	cout<<"\n Enter name :";
+	fflush(stdin);
+	cin.getline(s.name,30);
+	cout<<"\n Enter marks obtained in first subject (100) :";
+	cin>>s.marks[0];
+	
+	cout<<"\n Enter marks obtained in Second subject (100) :";
+	cin>>s.marks[1];
+	
+	cout<<"\n Enter marks obtained in Third Subject (100) :";
+	cin>>s.marks[2];
+	
+	//processing area
+	s.total = s.marks[0]+s.marks[1]+s.marks[2];
+	
+	float per = s.total/3;
+	
+	if(per>=90)
+	    s.grade = 'A';
+	if(per<90 && per>=80)
+		s.grade='B';
+	if(per<80)
+		s.grade ='C';
+		
+	// output phase
+	
+	cout<<"\n Roll No :"<<s.roll;
+	cout<<"\n Name    :"<<s.name;
+	cout<<"\n Grade   :"<<s.grade;
+	
+	return 0;
+}
diff --git a/structure/struct_defition.cpp b/structure/struct_defition.cpp
new file mode 100644
index 0000000..e875a7f
--- /dev/null
+++ b/structure/struct_defition.cpp
@@ -0,0 +1,18 @@
+#include<iostream>
+using namespace std;
+	struct student{
+	int roll;
+	char name[30];
+	float fees;
+	char grade;
+	char std[10];
+};
+
+int main()
+{
+
+	student s={10,"Saurabh",1234.56,'A',"12A"};
+	cout<<s.roll<<endl;
+	cout<<s.name<<endl;
+	return 0;
+}
diff --git a/structure/variable_declaration.cpp b/structure/variable_declaration.cpp
new file mode 100644
index 0000000..ff7bc19
--- /dev/null
+++ b/structure/variable_declaration.cpp
@@ -0,0 +1,19 @@
+#include<iostream>
+#include<string.h>
+using namespace std;
+	struct student{
+	int roll;
+	char name[30];
+	float fees;
+	char grade;
+	char std[10];
+}s={10,"saurabh sethi",2350.50,'B'};  // initialization method-4
+
+int main()
+{
+
+	
+	cout<<s.roll<<endl;
+	cout<<s.name<<endl;
+return 0;
+}