Student Management System(Project 1).cpp

#include <iostream>
using namespace std;
string arr1[20],arr2[20],arr3[20],arr4[20],arr5[20];
int total=0;
void enter()
{
	int ch=0;
	cout<<"How many students do you enter?"<<endl;
	cin>>ch;
	if(total==0)
	{
		total=ch+total;
		for(int i=0;i<ch;i++)
		{
			cout<<"\nEnter the data of the student: "<<i+1<<endl<<endl;
			cout<<"Enter name: "<<endl;
			cin>>arr1[i];
			cout<<"Enter roll no: "<<endl;
			cin>>arr2[i];
			cout<<"Enter course: "<<endl;
			cin>>arr3[i];
			cout<<"Enter class: "<<endl;
			cin>>arr4[i];
			cout<<"Enter contact: "<<endl;
			cin>>arr5[i];
		}
	}
	else {
		for(int i=total;i<ch+total;i++)
		{
			cout<<"\nEnter the data of student: "<<i+1<<endl<<endl;
			cout<<"Enter name";
			cin>>arr1[i];
			cout<<"Enter roll no: "<<endl;
			cin>>arr2[i];
			cout<<"Enter course: "<<endl;
			cin>>arr3[i];
			cout<<"Enter class: "<<endl;
			cin>>arr4[i];
			cout<<"Enter contact: "<<endl;
			cin>>arr5[i];
		}
		total=ch+total;
	}
}
void show()
	{
		if(total==0)
		{
			cout<<"No data is entered"<<endl;
		}
		else {
			for(int i=0;i<total;i++)
			{
				cout<<"\nData of the student"<<i+1<<endl<<endl;
				cout<<"Name"<<arr1[i]<<endl;
				cout<<"Roll no"<<arr2[i]<<endl;
				cout<<"Course"<<arr3[i]<<endl;
				cout<<"Class"<<arr4[i]<<endl;
				cout<<"Contact"<<arr5[i]<<endl;
				
			}
		}
	}
	void search()
	{
		if(total==0)
		{
			cout<<"No data is found"<<endl;
		}
		else {
			string rollno;
			cout<<"Enter the roll no. of the student: "<<endl;
			cin>>rollno;
			for(int i=0;i<total;i++)
			{
				if(rollno==arr2[i])
				{
					cout<<"Name"<<arr1[i]<<endl;
					cout<<"Roll no"<<arr2[i]<<endl;
					cout<<"Course"<<arr3[i]<<endl;
					cout<<"Class"<<arr4[i]<<endl;
					cout<<"Contact"<<arr5[i]<<endl;
					
				}
			}
		}
		
	}
	void update()
	{
		if(total==0)
		{
			cout<<"No data is entered"<<endl;
		}
		else {
			string rollno;
			cout<<"Enter the roll no. of the student which you want to update: "<<endl;
			cin>>rollno;
			for(int i=0;i<total;i++)
			{
				if(rollno==arr2[i])
				{
					cout<<"\nPrevious data"<<endl<<endl;
					cout<<"Data of the student"<<i+1<<endl;
					cout<<"Name"<<arr1[i]<<endl;
					cout<<"Roll no"<<arr2[i]<<endl;
					cout<<"Course"<<arr3[i]<<endl;
					cout<<"Class"<<arr4[i]<<endl;
					cout<<"Conatct"<<arr5[i]<<endl;
					cout<<"\nEnter new data"<<endl<<endl;
					cout<<"Enter name";
					cin>>arr1[i];
					cout<<"Enter Roll no";
					cin>>arr2[i];
					cout<<"Enter course";
					cin>>arr3[i];
					cout<<"Enter class";
					cin>>arr4[i];
					cout<<"Enter contact";
					cin>>arr5[i];
				}
			}
		}
	}
	void deleterecord()
	{
		if(total==0)
		{
			cout<<"No data is entered"<<endl;
		}
		else {
			int a;
			cout<<"Press 1 to delete all record"<<endl;
			cout<<"Press 2 to delete specific record"<<endl;
			cin>>a;
			if(a==1){
				total=0;
				cout<<"All record is deleted."<<endl;
			}
			else if(a==2){
				string rollno;
				cout<<"Enter the roll no. of student which you wanted to delete"<<endl;
				cin>>rollno;
				for(int i=0;i<total;i++)
				{
					if(rollno==arr2[i])
					{
						for(int j=1;j<total;j++)
						{
							arr1[j]=arr1[j+1];
							arr2[j]=arr2[j+1];
							arr3[j]=arr3[j+1];
							arr4[j]=arr4[j+1];
							arr5[j]=arr5[j+1];
							
						}
						total--;
						cout<<"Your required record is deleted"<<endl;
					}
				}
			}
			else {
				cout<<"Invalid input";
			}
		}
	}
	main()
	{
		int value;
		while(true)
		{
			cout<<"\nPress 1 to enter the data"<<endl;
			cout<<"Press 2 to show the data"<<endl;
			cout<<"Press 3 to search the data"<<endl;
			cout<<"Press 4 to update the data"<<endl;
			cout<<"Press 5 to delete the data"<<endl;
			cout<<"Press 6 to exit"<<endl;
			cin>>value;
			switch(value)
			{
				case 1:
					enter();
					break;
					
				case 2:
					show();
					break;
					
				case 3:
					search();
					break;
					
				case 4:
					update();
					break;
					
				case 5:
					deleterecord();
					break;
					
				case 6:
					exit(0);
					break;
					
				default:
					cout<<"Invalid input"<<endl;
					break;
					
						
					
			}
		}
	}