plz help....

[apoorvapantoola]

hi, i have done an user id n password program in c and i am storing the details in file..but when i try to login its not logging in......i am using turboc....plz help....this is the code.....

#include<stdio.h>
#include<conio.h>
#include<alloc.h>
#include<dos.h>
#include<string.h>

struct new_user
{
char first_name[10],last_name[10];
char loginid[20],password[10],re_password[10] ;
};




void main()
{

char pasword[10],username[20];
int a,b;
FILE *fp;
int i=0,j=0,k=0;

struct new_user nu;

clrscr();

fp=fopen("pass.txt","wb");

if(fp)
{

printf("FIRST NAME = ");
scanf("%s",nu.first_name);

printf("LAST NAME =");
scanf("%s",nu.last_name);

printf("LOGIN ID = ");
scanf("%s",nu.loginid);

printf("PASSWORD = ");

do
{
if((nu.password[i]=getch())==13)
{
break;
}
else
{
printf("*");

}
i++;
}while(nu.password[i]!=13);

nu.password[i]='\0';



printf("\nRE-PASSWORD = ");
do
{
if((nu.re_password[j]=getch())==13)
{
break;
}
else
{
printf("*");

}

j++;
}while(nu.re_password[j]!=13);

nu.re_password[j]='\0';



if(strcmp(nu.password,nu.re_password)==0)
{

fwrite(&nu,sizeof(nu),1,fp);
printf("\n");

fclose(fp);

printf("\nwritten");

}

else

{
printf("\n%s",nu.re_password);
printf("\n%s",nu.password);
printf("\npassword mismatch cannot write the file");

}

}
else

{

printf("file cannot open");
}
getch();

clrscr();

/* fp=fopen("pass.txt","rb");

if(fp)
{
fread(&nu,sizeof(nu),1,fp);

printf("%s\n%s\n%s\n%s\n",nu.first_name,nu.last_name,nu.loginid,nu.password);

fclose(fp);

}

else
{
printf("\ncannot open");

}*/

// getch();
//clrscr();

printf("USER NAME = ");
scanf("%s",username);

printf("PASSWORD = ");
do
{
if((pasword[k]=getch())==13)
{
break;
}
else
{
printf("*");

}

k++;
}while(pasword[k]!=13);

pasword[k]='\0';

printf("\n%s",pasword);

fp=fopen("pass.txt","rb+");
rewind(fp);

while(fread(&nu,sizeof(nu),1,fp))
{
rewind(fp);
//a=strcmp(username,nu.loginid);
//b=strcmp(pasword,nu.password);

if(nu.loginid == username)//&&nu.password == pasword)
{
printf("logged on \n");
break;


}

// printf("%s\n%s\n%s\n%s\n",nu.first_name,nu.last_name,nu.loginid,nu.password);
}
if(feof(fp))
{
printf("\nit does not exist or invalid\n");
}
fclose(fp);



getch();

}

[bluecoder]

use choice switch case statement .
for the choice such as
"Enter 1 for login "
"Enter 2 for changing the user id and password . "

[apoorvapantoola]

i want to login with the same id which i have stored......its not logging in .......