my problem is about checking the subject related to the user
a text file structure as below:
username_1 password subject_1 subject_2 subject_ n
username_2 password subject_1 subject_2 subject_ n
username_3 password subject_1 subject_2 subject_ n
.
.
.
username_m password subject_1 subject_2 subject_ n
in my problem the user will enter his username and the subject and i want to check if the subjct that entered is related to that user.
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
int main()
{
ifstream instaff ("loginstaff.in"); //creating the stream
if (!instaff)
{
cout << "no file" << endl;
exit (0);
}
char user[10],username[10],subject[30], sub[30] , pass[30];
cout<<"enter username: ";
cin.getline(username,10,'\n');//getting the username from the keyboard
cout<<"enter subject: ";
cin.getline(subject,30,'\n');//getting the subject from the keyboard
int i=0;
while(!instaff.eof()) // while not the end of the file
{
instaff.getline(user,10,' '); // get the username from the text file
instaff.getline(pass,30,' '); // get the password from the text file
if(strcmp(user,username)==0) // compare username and the one from the file
{
char let;
while (instaff.get(let)) // take character by character
{
sub[i]=let; // assign the letter to the subject array
i++;// increment the array index for next letter
if (let==' ') // if the letter is space which means the end of the subject
{
sub[i]='\0'; // close the subject string
i=0; // return the array index to the first position
if (strcmp(sub,subject)==0) // compare the input subject with that in the file
{
cout << "valid"; // if they are same output "valid"
return 0; // end the program
}
}
if (let=='\n') // if the letter is '\n' which means the end of the subject list of that user
{
cout << "not valid" <<endl; // no subjects match
return 0;
}
}
}
}
return 0;
}but i am not getting the right output
