login with hidden password

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>

int option;

struct data
{
    char name[50],pass[50];
}inputdata,odata;

void login();                           //function to login
void signup();                          // function to store data of new user
void password();                        // function to store password with hiding it too
void logincheck();                      //function to check username and pass word entered by the user
void signupcheck();                     // function to check the username so that it wont repeat
void write();                           // function to store user data

int main()
{
    printf("1. LOGIN \n 2.SIGNUP \n");
    scanf("%d",&option);
         switch(option)
         {
             case 1:    login();
                        break;
             case 2:    signup();
                        break;
             default :  printf("\n INCORRECT CHOICE !!!!");
         }
    return 0;
}

void login()
{
    printf("Enter your username :- ");
    scanf("%s",inputdata.name);
    printf("Enter your password :- ");
    password();
    logincheck();
}

void signup()
{
    printf("Enter your username :- ");
    scanf("%s",inputdata.name);
    printf("Enter your password :- ");
    signupcheck();
}

 void password()
            {
            int i=0,run;
            char temp;
                do
                {
                    temp=getch();
                    if(temp!='\r'||temp=='\b')
                    {

                          if(temp=='\b')
                        {
                        --i;
                        //inputdata.pass[i]='\0';
                        system("CLS");

                             printf("1. LOGIN \n 2.SIGNUP \n %d", option);
                             printf("\n Enter your username :- %s ",inputdata.name);
                             printf("\n Enter your password :- ");
                        for(run=0;run<i;++run)
                            printf("*");
                        }
                        else
                        {
                        inputdata.pass[i]= temp;
                        ++i;
                        printf("*");
                        }
                    }
                    else
                       {
                       //printf("You Pressed Enter %s" ,inputdata.pass);
                       break;
                       }
                }while(i<=49);
            }

    void signupcheck()
    {
    FILE *check;
    check=fopen("data.txt","r");
      while(!feof(check))
                 {
                     fread(odata.name,1,sizeof(odata.name),check);
                     fread(odata.pass,1,sizeof(odata.pass),check);
                     if(strcmp(inputdata.name,odata.name)==0)
                     {
                        printf("\n THIS USERNAME IS ALREADY IN USE PLEASE CHOOSE ANOTHER USERNAME !!!");
                        break;
                     }
                     else
                        password();
                        write();
                 }
                 fclose(check);
    }

        void logincheck()                                 //loginchck function!!!!!!
        {
            FILE *out;
               if((out=fopen("data.txt","r"))==NULL)
                   {
                       printf("ERROR IN OPENING FILE");
                       system("pause");
                   }
                 while(!feof(out))
                 {
                     fread(odata.name,1,sizeof(odata.name),out);
                     fread(odata.pass,1,sizeof(odata.pass),out);
                     if(strcmp(inputdata.name,odata.name)==0)
                     {
                         if(strcmp(inputdata.pass,odata.pass)==0)
                         {
                             printf("\n LOGIN SUCCESSFUL !!!");
                             break;
                         }
                         else
                             printf("\n LOGIN FAILED !!!");
                             break;
                     }
                     else
                     {
                         printf("\nINCORRECT USERNAME !!!!");
                         break;
                     }
                 }
                 fclose(out);
        }

            void write()
            {
                FILE *in;
                if((in=fopen("data.txt","w"))==NULL)
                   {
                       printf("ERROR IN OPENING FILE");
                       system("pause");
                   }
                fwrite(inputdata.name,1,sizeof(inputdata.name),in);
                fwrite(inputdata.pass,1,sizeof(inputdata.pass),in);
                fclose(in);
            }