i am new to c++ and have been asked to create an encryption programme using the zig zag (rail fence) cipher. this will be saved to a file, and when it is opened the file will be decrypted.
a user will type in a message. The message is then read off in rows. For example, i am using 3 tiers and a message of 'WE ARE DISCOVERED. FLEE AT ONCE', the cipherer writes out:
W . . . E . . . C . . . R . . . L . . . T . . . E
. E . R . D . S . O . E . E . F . E . A . O . C .
. . A . . . I . . . V . . . D . . . E . . . N . .
Then reads off:
WECRL TEERD SOEEF EAOCA IVDEN
i know that one way of doing this is to have a 2D array and toggle it's rows from 0 to 2 and then 2 to 0 one after the other until you finish the string. But since i am new at c++ i have not learnt how to dothis yet.
/*Header Files*/
#include <stdio.h>
#include <conio.h>
#include "bcio2.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/*Function Prototype*/
void sleep(void);
void sleep( int nbr_seconds );
void header(void);
void filewrite(void);
void menu(void);
int valid(char s[]);
void fileread(void);
/*Validatoion Error Message*/
char msg0[40]="\t\t\tTry Again!\a";
char msg1[60]="YOU HAVE ENTERED MORE THAN ONE CHARACTER!\a";
char msg2[40]="YOU HAVE ENTERED BETWEEN 5 AND 9!\a";
char msg3[60]="YOU HAVE FORGOTTEN TO ENTER A VALID OPTION!!\a";
/*Variables & Constants*/
char input[8];
int multi;
int flag=0;
char x;
int conv;
/*START OF MAIN FUNCTION*/
void main(void)
{
header();
sleep();
menu();
}
/*HEADER SCREEN TO DISPLAY GRAPHICS*/
void header(void)
{ int x;//inner loop counter//
int y;//outer loop counter//
char d = ' ';
settextcolour(magenta, BRIGHT);
/*print top line and ends*/
printf("\n\t%c",201);
for(x=1;x<15;x++)
printf("%c",205);
printf("%c",203);
for(x=1;x<15;x++)
printf("%c",205);
printf("%c\n",187);
/*print bottom right and left sides*/
for(y=1;y<8;y++){
printf("\t%c",186);
for(x=1;x<15;x++)
printf("%c",d);
printf("%c",186);
for(x=1;x<15;x++)
printf("%c",d);
printf("%c\n",186);
}
/*print middle line and edges*/
printf("\t%c",200);
for(x=1;x<15;x++)
printf("%c",205);
printf("%c",202);
for(x=1;x<15;x++)
printf("%c",205);
printf("%c",206);
for(x=1;x<30;x++)
printf("%c",205);
printf("%c\n",187);
/*print bottom right and left sides*/
for(y=1;y<8;y++){
printf("\t\t\t\t %c",186);
for(x=1;x<30;x++)
printf("%c",d);
printf("%c\n",186);
}
/*print bottom line and edges*/
printf("\t\t\t\t %c",200);
for(x=1;x<30;x++)
printf("%c",205);
printf("%c\n",188);
}
/*SPLASH SCREEN*/
void sleep(void)
{
int ctr;
int wait =1;// assigned for three seconds
int x;//inner loop counter//
int y;//outer loop counter//
char d = ' ';
clrscr();
for (ctr=1; ctr <= wait; ctr++){
settextcolour(magenta, BRIGHT);
printf("\n\n\t\t\tWELCOME TO THE CANDID ECHO PRESS\n");
puts("\t\t\tPLEASE WAIT WHILE THE PROGRAMME LOADS\n");
header();
printf("\n\n\t\t\tPRODUCED BY: Richard Lasowski");
sleep( (int) 2 ); /* pause for 2 seconds */
}
}
void sleep( int nbr_seconds )
{
clock_t goal;
goal = ( nbr_seconds * CLOCKS_PER_SEC ) + clock();
while( goal > clock() )
{
; /* loop */
}
}
/*TO DISPLAY MENU SCREEN*/
void menu(void)
{
clrscr();
header();
gotoxy(17,20);
puts("WECLOME TO MAIN MENU SCREEN! FILE PROCCESSING:");
gotoxy(25,30);
settextcolour(magenta, BRIGHT);
puts("* CREATE A FILE .......a");
gotoxy(25,32);
puts("* OPEN A FILE .........b");
gotoxy(25,34);
puts("* EXIT THE PROGRAMME...c");
gotoxy(25,26);
puts("CHOOSE A VALID OPTION NUMBER:");
gotoxy(30,36);
puts("CHOOSE AN OPTION:");
gets(input);
flag=valid(input);
if(!flag)
{
gotoxy(32,46);
flushall();
}
}
/*FILE WRITNG*/
void filewrite(void)
{
flushall();
clrscr();
header();
FILE *fp;
char str[165][165];
char str1[330]
char filename[10];
gotoxy(24,20);
puts("FILE PROCCESSING: FILE WRITING\n\n");
puts("Enter up to 333 characters (no spaces):");
scanf("%s",&str);
puts("\n\nEnter a file name (8 characters max):");
scanf("%s",&filename);
fp=fopen(filename,"w");
fprintf(fp,"%s",str);
fclose(fp);
flushall();
header();
menu();
}
/*FILE READING*/
void fileread(void)
{
flushall();
clrscr();
header();
char create;
char filename[8];
FILE *file1;
gotoxy(24,20);
puts("FILE PROCCESSING: FILE READING");
gotoxy(25,25);
puts ("THIS PROGRAM READS (OPENS) FILE");
gotoxy(13,28);
fputs("Enter file name: ",stdout);
gets(filename);
gotoxy(13,29);
file1 = fopen(filename ,"r");
if (file1 == NULL)
{
gotoxy(13,32);
puts("FILE MISSING");
gotoxy(23,42);
puts("Press any key to continue");
gotoxy(49,42);
getch();
flushall();
}
gotoxy(13,31);
printf("Reading charcters from the file: %s\n\n",filename);
gotoxy(13,33);
while((create=fgetc(file1)) !=EOF)
{
//delay(100);
putchar(create);
}
fclose(file1);
gotoxy(23,42);
puts("Press any key to continue");
gotoxy(49,42);
getch();
flushall();
}
/*VALIDATE INPUT (VALID)*/
int valid(char input[])
{
int count=0;
int test=0;
flag++;
conv = atof(input);
/*test option 'a' file write*/
{
int x;
for(x=0;x<strlen(input);x++)
{
if(input[x]=='a')
filewrite();
}
}
/*test option 'b' file read*/
{
int x;
for(x=0;x<strlen(input);x++)
{
if(input[x]=='b')
fileread();
}
}
/* test option 'c' exit*/
{
int x;
for(x=0;x<strlen(input);x++)
{
if(input[x]=='c')
exit(0);
}
}
/* test for range 1 to 4*/
if(conv<1 || conv>4)
{
flushall();
clrscr();
header();
gotoxy(27,20);
puts(" MENU (OPTION) VALIDATION ");
gotoxy(15,22);
puts (" PLEASE CHOOSE THE VALID OPTIONS AVAILABLE!");
gotoxy(15,24);
puts(msg0);
flushall();
}
/*test all input in range 0 to 4*/
if(count==1)
{
int x;
for(x=0;x<strlen(input);x++)
{
//if((input[x]>='1'||input[x]=='a')&&(input[x]<='4'||input[x]=='a'));
if(input[x]>='1' && input[x]<='4');
}
}
else
{
settextcolour(magenta, BRIGHT);
gotoxy(15,28);
puts(msg3);
test++;
flushall();
}
/*if input errors set flags*/
if(test>0)
{
flag--;
gotoxy(23,30);
puts(" - Press any key to continue -");
gotoxy(54,30);
getch();
flushall();
header();
menu();
}
else
;
return flag;
}if someone could help me out that would be great, cheers
