enum in a structure doesn't work passed to a function?

[tayyab6]

I have made a program in C++ which does not accept the value of a an enumeration variable defined within a structure, when I pass the structure into a function.
It does not even accept the value YES or NO in the main function.

Help me out please. :)

#include <iostream>
using namespace std;

struct student
{
	char name[20];
	int age;
	enum {YES,NO} admit;
	union 
	{
		int FSCMarks;
		char ALMarks;

	} marks;
	int FSCcheck;
	int ALcheck;

};

void computeEligibility(struct student);


void main()
{
	int check,n;
	cin>>n;

	cin.ignore();

	struct student *s=new struct student [n];

	for (int i=0; i<n; i++)
	{
		cout<<"Enter name: ";
		cin.getline(s[i].name,100,'\n');
		cout<<"Enter age: ";
		cin>>s[i].age;
		cout<<"Enter 1 if FSc and 2 if A Level: ";
		cin>>check;


		if (check==1)
		{
			cout<<"Enter percentage in FSc: ";
			cin>>s[i].marks.FSCMarks;
			s[i].FSCcheck=1;

		}

		if (check==2)
		{
			cout<<"Enter grade in A Levels: ";
			cin>>s[i].marks.ALMarks;
			s[i].ALcheck=1;

		}

		computeEligibility(s[i]);
	}

}

void computeEligibility(struct student s)
{
	if (s.FSCcheck==1)
	{
		if(s.age<35 && s.marks.FSCMarks>85)
			s.admit=YES;		
		else
			s.admit=NO;
	}

	if (s.ALcheck==1)
	{
		if(s.age<35 && s.marks.ALMarks=='A')
			s.admit=YES;
		else
			s.admit=NO;
	}

	if(s.admit==YES)
		cout<<"Eligible.\n";

	if(s.admit==NO)
		cout<<"Not Eligible.\n";

}

[weaknessforcats]

An enum is not a type. What it is a named integer value. Like you name 3 RED and 4 BLUE. Then you use RED and BLUE in your code instead of 3 and 4

So an enum like this:

enum Color {RED=3,BLUE=4};

just says that RED can be used instead of 3 and BLUE can be used instead of 4 when using variables typed as enum Color.

Then in a struct:

struct MyStruct
{
   enum Color var;
};

var is an int with a value of 3 or 4.

You set the value this way:

struct MyStruct data;
data.var = RED;   /* same as coding data.var = 3