Trying to make a login program [closed] - c++

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I'm trying to make a login page. When the program starts, the user has to type Guest and Password 1234 and he can edit his/her account. However, when I try to run it, it says:
Line 15 "Error incompatible types in assignment of 'const char[6]' to 'char[20]'
Line 16 "Error incompatible types in assignment of 'const char[5]' to 'char[20]'
I think it has to do with pointers but I am still a c++ newbie so I am having a hard time to understand pointers
#include <iostream>
#include <cstring>
#include <stdio.h>
#include <string.h>
using namespace std;
const int LINE_LENGTH=20;
const int ID_LENGTH=8;
struct profile{char user[20];char password[20];double CGPA; int ID;};
int main(){
int count=0, i;
profile student[10];
student[0].user="Guest"; //Line 15
student[0].password="1234"; //Line 15
char signupName[20];
char signupPassword[20];
while (count==0)
{
cout << "#############################################\n";
cout << " Welcome to my program! \n";
cout << " Sign up to get started \n\n\n";
cout << " If you are starting, use username 'Guest' \n";
cout << " and password '1234' \n\n";
cout << "Username: ";
cin >> signupName;
cout << "Password: ";
cin >> signupPassword;
cout << "#############################################\n";
for (i=0;i<11; i++)
{
if(strcmp(signupName,student[i].user)==0 && strcmp(student[i].password,signupPassword)==0)
{
count++;
}
}
if(count==0)
{
system("cls");
cout<<"Your username and/or password is incorrect\n";
}
}
system("cls");
}

Answer 1

You need two minor changes to your code! First, as Francois Andrieux says, you can't assign char array strings with = ...
// student[0].user = "Guest";
// student[0].password = "1234";
strcpy(student[0].user, "Guest");
strcpy(student[0].password, "1234");
Second, your for loop runs once to often:
// for (i = 0; i < 11; i++)
for (i = 0; i < 10; i++) // Note: The last element in an array of 10 is x[9]!