My while, if and else are getting the same error: expected unqualified-id before 'while'

Question

Whats the problem? with if/else:

#include <iostream>
using namespace std;

int main(){
int a;
cout << "Enter Code" << endl;
cin >> a;
}
if (a=876)
{cout << "Welcome." << endl;}
else
{cout << "Error 876: Wrong Code" << endl;}

With while:

int num = 1;
while (num < 6) {
cout << "Number: " << num << endl;
num = num + 1;
}

Answer 1

#include <iostream>
using namespace std;

int main(){
int a = 0;
while (a != 876) {
cout << "Enter Code" << endl;
cin >> a;
if (a != 876) {
cout << "Error 876: Wrong Code" << endl;
}
}
cout << "Welcome." << endl;
}

Answer 2

hey you made a lot of mistakes!!!!
this is the correct code which you were trying

#include <iostream>
using namespace std;

int main(){
int a;
cout << "Enter Code" << endl;
cin >> a;

if (a==876)
{cout << "Welcome." << endl;}
else
{cout << "Error 876: Wrong Code" << endl;}

int num = 1;
while (num < 6) {
cout << "Number: " << num << endl;
num = num + 1;
}
}

Answer 3

Ty