Caesar cipher program question

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Why is this run time error occurring as "Unable to open Maths.lib"

C++

//Caesar Cipher

#include<iostream.h>
#include<conio.h>
//#include<string.h>
//#include<process.h>

char username[20];
char plain_text[20];
char cipher_text[20];

char encrypt(char,int);
//class Caesar
//{
// public:
void main()
{

	 cout<<"\n Enter your username";
	 cin>>username;

	 cout<<"\n Enter your password (it must be only characters)";
	 cin>>plain_text;

	 for(int i=0;i<20;i++)
	 {
	  switch(plain_text[i])
	  {
	   case 'a':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	   case 'b':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'c':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'd':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'e':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'f':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'g':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'h':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'i':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'j':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'k':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'l':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'm':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'n':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'o':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'p':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'q':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'r':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 's':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 't':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'u':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'v':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'w':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'x':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'y':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    case 'z':
		    cipher_text[i]=encrypt(plain_text[i],i);
		    break;
	    default: cout<<"\n Please enter only lowercase characters";
		    break;
	    }
	  }
 cout<<"The encrypted password is:- ";
    for(i=0;i<20;i++)
    {
     cout<<cipher_text[i];
    }

  getch();
 }

char encrypt(char letter,int j)
	{
	  int i=j;
	 switch(letter)
	  {
	   case 'a':
		    letter=plain_text[i+5];
		    break;
	   case 'b':
		    letter=plain_text[i+5];
		    break;
	    case 'c':
		    letter=plain_text[i+5];
		    break;
	    case 'd':
		    letter=plain_text[i+5];
		    break;
	    case 'e':
		    letter=plain_text[i+5];
		    break;
	    case 'f':
		    letter=plain_text[i+5];
		    break;
	    case 'g':
		    letter=plain_text[i+5];
		    break;
	    case 'h':
		    letter=plain_text[i+5];
		    break;
	    case 'i':
		    letter=plain_text[i+5];
		    break;
	    case 'j':
		    letter=plain_text[i+5];
		    break;
	    case 'k':
		    letter=plain_text[i+5];
		    break;
	    case 'l':
		    letter=plain_text[i+5];
		    break;
	    case 'm':
		    letter=plain_text[i+5];
		    break;
	    case 'n':
		    letter=plain_text[i+5];
		    break;
	    case 'o':
		    letter=plain_text[i+5];
		    break;
	    case 'p':
		    letter=plain_text[i+5];
		    break;
	    case 'q':
		    letter=plain_text[i+5];
		    break;
	    case 'r':
		    letter=plain_text[i+5];
		    break;
	    case 's':
		    letter=plain_text[i+5];
		    break;
	    case 't':
		    letter=plain_text[i+5];
		    break;
	    case 'u':
		    letter=plain_text[i+5];
		    break;
	    case 'v':
		    letter=plain_text[i+0];
		    break;
	    case 'w':
		    letter=plain_text[i+1];
		    break;
	    case 'x':
		    letter=plain_text[i+2];
		    break;
	    case 'y':
		    letter=plain_text[i+3];
		    break;
	    case 'z':
		    letter=plain_text[i+4];
		    break;
	    default: cout<<"\n Please enter only lowercase characters";
		    break;
	   }
	  return letter;
	 }

Posted 22-Dec-11 1:26am

CurrentlyBE

Updated 22-Dec-11 4:03am

Wendelius

v4

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Comments

Richard MacCutchan 22-Dec-11 7:36am

Show the exact error message and which line it is referring to.

Resmi Anna 22-Dec-11 8:13am

you have written the function encrypt()within ur main

CurrentlyBE 22-Dec-11 9:41am

is my logic for Caesar correct and even if it is correct is this the only way.

2 solutions

Solution 2

Your code is too lengthy and stuffy. I found the best code here:
http://wncoder.blogspot.in/2012/05/c-caesar-cipher-code.html

Posted 22-May-12 21:41pm

Akash Deep Singh

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CPallini · Accepted Answer · 2011-12-22T02:08:00

Solution 1

about the line:

char encrypt(char letter)

My compiler reports:

C++

error C2601: 'encrypt' : local function definitions are illegal

and (of course) it is right. You cannot have local functions in C++ (though you may have lambdas).

Put encrypt out of the main body.

Posted 22-Dec-11 2:08am

CPallini

Comments

RaisKazi 22-Dec-11 9:40am

My 5.

CPallini 22-Dec-11 15:19pm

Thank you.

Albert Holguin 22-Dec-11 11:07am

Looks like he or someone else changed the code (didn't look too closely at the version history, just noticed it's different)... +5 anyway...

CPallini 22-Dec-11 15:19pm

Thank you.

CurrentlyBE 22-Dec-11 11:43am

yes I updated the question as first error was solved but new one has occurred
Unable to open Maths.lib

Monjurul Habib 22-Dec-11 14:29pm

5!

CPallini 22-Dec-11 15:20pm

Thank you.