C++ Run Time Error "Stack around the variable 'Student' was corrupted."

[Umad Ahmad]

AnyOne Please Guide Me on my This Error <
"Stack around the variable 'Student' was corrupted."

I Receives it when I copy Members of Structure  "StudentInfo" into Structure "FailStudents" 
using  
list\[i\].FullName  =  Student\[i\].FullName ;
list\[i\].RollNo = Student\[i\].RollNo;

Here list is Structure Variable of Structure "FailStudents" and Student is Structure Variable of Structure "StudentInfo"



/\*
An array stores details of 5 students (rollno, name, marks in three subject).
Write a program to create such an array and print out a list of students who have failed in more than one subject.
\*/
#include
#include
using namespace std;

const int No\_Of\_Students = 5;

void main()
{
	struct StudentInfo
	{
		int RollNo;
		string FullName;
		int marks\[2\];
	};
	StudentInfo Student\[No\_Of\_Students\];
	struct FailStudents
	{
		int RollNo;
		string FullName;
		int marks\[2\];
	};
	FailStudents list\[No\_Of\_Students\];
	int NoOfFailStudents = 0;
	for (int i = 0; i < No\_Of\_Students; i++)
	{
		cout << "Enter Student NO " << i + 1 << \\" FullName : \\t";
		cin >> Student\[i\].FullName;
		cout << "Enter Student NO " << i + 1 << " Roll Number : \\t";
		cin >> Student\[i\].RollNo;
		int failSubjects = 0;

		// Subjects Marks Input 
		for (int k = 0; k <= 2; k++) {
			cout << "Enter Student NO " << i + 1 << " Subject " << k + 1 << " Marks : \\t";
			cin >> Student\[i\].marks\[k\];

			if ((Student\[i\].marks\[k\]) < 40)
			{
				failSubjects++;
			}
		}
		if (failSubjects > 1)
		{
			NoOfFailStudents++;
			list\[i\].FullName = Student\[i\].FullName;

			list\[i\].RollNo = Student\[i\].RollNo;
			cout << "Student Name "<< list\[i\].FullName << "is fail"<< endl;
			cout << "Having Rol Number  " << list\[i\].RollNo << endl;
			// list\[i\].marks = Student\[i\].marks;
		}
		cout << "\\n \\n ";
	}

	system("pause");

}

[Lost User]

You have declared marks as a 2 element array, but your loop runs 3 times.

for (int k = 0; k <= 2; k++) { // <-- this will run three loops
cout << "Enter Student NO " << i + 1 << " Subject " << k + 1 << " Marks : \t";
cin >> Student[i].marks[k]; // when k == 2 you are overwriting unallocated memory

if ((Student\[i\].marks\[k\]) < 40)
{
    failSubjects++;
}

}

It should be:

for (int k = 0; k < 2; k++) { // k must be only 0 or 1