#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
int max_students=100;   //structure defination
struct Student 
{
	string name;
	int roll_no;
	char grade;
	int attendence;
};
int main()
{
	Student students[max_students];
	int studentcount=0;
	int choice;
	LOOP:
	cout<<"-------Welcome to Attendence Management System-------"<<endl;
	cout<<"--------------Are you Admin or Student---------------"<<endl;
	cout<<"1. Admin View"<<endl;
	cout<<"2. Student View"<<endl;
	cout<<"Enter your choice: ";
	cin>>choice;
	switch(choice)
	{
		case 1:
			do{
				cout<<"-------Admin View-------"<<endl;
				cout<<"1. Add Student"<<endl;
				cout<<"2. Mark Attendence"<<endl;
				cout<<"3. Display Attendece"<<endl;
				cout<<"4. Go back to admin or student selection section"<<endl;
				cout<<"5. Exit"<<endl;
				cout<<"Enter your choice: ";
				cin>>choice;
				switch (choice)
				{
					case 1:
						if(studentcount<max_students)
						{
							cout<<"Enter student name: ";
							cin>> students[studentcount].name;
							cout<<"Enter roll no: ";
							cin>>students[studentcount].roll_no;
							cout<<"Enter grade: ";
							cin>>students[studentcount].grade;
							studentcount++;
							cout<<"Student Added Successfully"<<endl;	
						}
            else
            {
							cout<<"Maximun number of students added"<<endl;
						}
						break;
					case 2:
							if(studentcount==0)
							{
								cout<<"No student to mark Attendence. First add students"<<endl;
							}
              else
              {
							int rollnumber;
							cout<<"Enter roll no: ";
							cin>>rollnumber;
							int foundIndex = -1;
							for(int i=0;i<studentcount;i++)
							{
								if(students[i].roll_no==rollnumber)
							{
									cout<<"Attendence Marked successfully"<<endl;
									 foundIndex=i;
									break;
							}
							}
							if (foundIndex == -1)
							 {
                            cout << "Student not found." << endl;
							 }
					    }
						break;
					case 3:
							if(studentcount==0){
								cout<<"No student to mark Attendence. First add students"<<endl;
							}else
							{
								cout<<"-----Attendence Record---"<<endl;
								cout<<setw(20)<<"Name"<<setw(20)<<"Roll_no"<<setw(20)<<"Grade"<<setw(20)<<"Attendence"<<endl;
								
								for(int i=0; i<studentcount; i++){
									cout<<setw(20)<<students[i].name<<setw(20)<<students[i].roll_no<<setw(20)<<students[i].grade<<setw(20);
									 if (students[i].attendence==1)
                     cout<<"Present"<<endl;
                   else
                     cout<<"Absent"<<endl;
								}
							}
							break;
							case 4:
							goto LOOP;
							case 5:
								cout<<"Exit the program!Good bye"<<endl;
								break;
								default:
								cout<<"Invalid choice!"<<endl;
							}
				}				
			while(choice!=5);
            break;	
		case 2:
		    do {
						cout<<"-------Srudent View-------"<<endl;
				     	cout<<"1. View Attendance\n";
                        cout<<"2. Exit\n";
                        cout<<"Enter your choice: ";
                        cin>>choice;
                        switch(choice){
                       case 1:
							if(studentcount==0)
							{
								cout<<"No student to mark Attendence. First add students"<<endl;
							}
							else
							{
								for(int i=0;i<studentcount;i++)
								{
									cout<<students[i].name<<students[i].roll_no<<students[i].grade<<students[i].attendence;
								}
							}
							break;
					   case 2:
								cout<<"Exit the program!Good bye";
								break;
							default:
								cout<<"Invalid choice!";
							}
					}
                    while(choice!=2);
					break;
				}
					} 

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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
} 

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
} 

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}  

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition); 

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}