password encrytption

#include<stdio.h>
#include <math.h>
using namespace std
#define EXP(z) (sqrt((z*z*z*z-z)/(2*z))
char password[30];
char a[30];
int ASCI;
FILE *fp;
void title(void);

void head(void);

void setup(void);            // for Setting up of password file

void confirm_pswrd(void);   //will ask for the password & confirm it

void process_pswrd(void);  //for processing the password

int Get_ASCI(char);        //for fetching the asci code

void encrypt(int);         //for encryption

void decode(void);         //For decoding

void input(void);          //for inputting the password

void choice(void);

int main()
    {
     title();
//     confirm_pswrd();
    return 0;
    }

void confirm_pswrd(void)
     {
     fp=fopen("PASSWORD","r");
     if(fp==NULL)
                  setup();
     else
       {
        int index;
        fclose(fp);
        input();
        decode();
        index=strcmp(password,a);
        if(index==0)
        {
                  printf("THE PASSWORD IS RIGHT\n");
//                  choice();
        }
        else
        {
                   system("clear");
                   printf("THE PASSWORD IS WRONG\nPLEASE TRY AGAIN\n");
                   confirm_pswrd();
        }
       }
     }



int Get_ASCI(char x)
    {
    int k;
    k=x;
    return k;
    }

void encrypt(y)
     {
     int k,n,i;
     char ch;
     n=sqrt((y*y*y*y-y)/(2*y));
     fp=fopen("PASSWORD","a");
     for(k=0,i=0;k<n;k++)
             {
             ch='*';
             fputc(ch,fp);
             }
      ch=' ';
      printf(" ");
      fputc(ch,fp);
      fclose(fp);
     }

void process_pswrd(void)
     {
     int i;
     for(i=0;i<=10;i++)
        {
        if(a[i]=='\0')
          {
          break;
          }
        else
          {
          ASCI=Get_ASCI(a[i]);
          encrypt(ASCI);
          }
        }
     }


void decode(void)
     {
     int n[20],k,j=0,i,a,exp,d,z,y;
     char ch;
     fp=fopen("PASSWORD","r");
    i=0;
     while(ch!= EOF)
                   {
                    ch=fgetc(fp);
                    if(ch=='*')
                      {
                        i++;

                      }
                    else
                      {
                         if(ch!=EOF)
                         {
                         n[j]=i;
                         i=0;
                         j++;
                         }
                      }
                    }
     fclose(fp);
     d=j-1;
     for(i=0;i<=d;i++)
        {
        a=n[i];
        for(k=1;k<=123;k++)
           {
           z=k;
           y=k;
           exp=sqrt((z*z*z*z-z)/(2*z));
           if(a==exp)
                        {
                        password[i]=(char)y;
                        }
           }
        }
     }

void setup(void)
     {
       head();
       printf("\n\n\t\t\tWELCOME TO SETUP WIZARD\n\n\n\n");
       head();
       printf("\n\nPlease input the new password :");
       scanf("%s",a);
       process_pswrd();
       confirm_pswrd();
     }


void input(void)
     {
     head();
     printf("Enter the password\n");
     scanf("%s",a);
     }

void choice(void)
     {
                  system("clear");
                  printf("\n\n\n\n\n\n\t\t\tACCESS GRANTED");
     }