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help with an encryption/decryption program.

Mar 2, 2017 at 10:25pm
mayukhC (13)
i keep getting the errors

.\encrypt.cpp(5): error C2447: '{': missing function header (old-style formal list?)
.\encrypt.cpp(118): error C2447: '{': missing function header (old-style formal list?)
.\encrypt.cpp(237): error C2065: 'results': undeclared identifier
.\encrypt.cpp(245): error C2065: 'results': undeclared identifier
.\encrypt.cpp(250): error C2065: 'results': undeclared identifier
.\encrypt.cpp(252): error C2065: 'results': undeclared identifier

this is my code
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  #include "encrypt.h"
#include <iostream>

string encrypt( string input );
{
  string results = "";
  for ( int i=0; i<input.length(); i++ )
  {
    if ( input[i] == 'a' )
    {
      results = results + "z";
    }
    else if ( input[i] == 'b' )
    {
        results = results + "y";
    }
    else if ( input[i] == 'c' )
    {
        results = results + "x";
    }
    else if ( input[i] == 'd' )
    {
        results = results + "w";
    }
    else if ( input[i] == 'e' )
    {
        results = results + "v";
    }
    else if ( input[i] == 'f' )
    {
        results = results + "u";
    }
    else if ( input[i] == 'g' )
    {
        results = results + "t";
    }
    else if ( input[i] == 'h' )
    {
        results = results + "s";
    }
    else if ( input[i] == 'i' )
    {
        results = results + "r";
    }
    else if ( input[i] == 'j' )
    {
        results = results + "q";
    }
    else if ( input[i] == 'k' )
    {
        results = results + "p";
    }
    else if ( input[i] == 'l' )
    {
        results = results + "o";
    }
    else if ( input[i] == 'm' )
    {
        results = results + "n";
    }
    else if ( input[i] == 'n' )
    {
        results = results + "m";
    }
    else if ( input[i] == 'o' )
    {
        results = results + "l";
    }
    else if ( input[i] == 'p' )
    {
        results = results + "k";
    }
    else if ( input[i] == 'q' )
    {
        results = results + "j";
    }
    else if ( input[i] == 'r' )
    {
        results = results + "i";
    }
    else if ( input[i] == 's' )
    {
        results = results + "h";
    }
    else if ( input[i] == 't' )
    {
        results = results + "g";
    }
    else if ( input[i] == 'u' )
    {
        results = results + "f";
    }
    else if ( input[i] == 'v' )
    {
        results = results + "e";
    }
    else if ( input[i] == 'w' )
    {
        results = results + "d";
    }
    else if ( input[i] == 'x' )
    {
        results = results + "c";
    }
    else if ( input[i] == 'y' )
    {
        results = results + "b";
    }
    else if ( input[i] == 'z' )
    {
        results = results + "a";
    }
    return (results);
  }
}

string decrypt( string input );
{
  string results = "";
  for ( int i=0; i<input.length(); i++ )
  {
    if ( input[i] == 'a' )
    {
      results = results + "z";
    }
    else if ( input[i] == 'b' )
    {
        results = results + "y";
    }
    else if ( input[i] == 'c' )
    {
        results = results + "x";
    }
    else if ( input[i] == 'd' )
    {
        results = results + "w";
    }
    else if ( input[i] == 'e' )
    {
        results = results + "v";
    }
    else if ( input[i] == 'f' )
    {
        results = results + "u";
    }
    else if ( input[i] == 'g' )
    {
        results = results + "t";
    }
    else if ( input[i] == 'h' )
    {
        results = results + "s";
    }
    else if ( input[i] == 'i' )
    {
        results = results + "r";
    }
    else if ( input[i] == 'j' )
    {
        results = results + "q";
    }
    else if ( input[i] == 'k' )
    {
        results = results + "p";
    }
    else if ( input[i] == 'l' )
    {
        results = results + "o";
    }
    else if ( input[i] == 'm' )
    {
        results = results + "n";
    }
    else if ( input[i] == 'n' )
    {
        results = results + "m";
    }
    else if ( input[i] == 'o' )
    {
        results = results + "l";
    }
    else if ( input[i] == 'p' )
    {
        results = results + "k";
    }
    else if ( input[i] == 'q' )
    {
        results = results + "j";
    }
    else if ( input[i] == 'r' )
    {
        results = results + "i";
    }
    else if ( input[i] == 's' )
    {
        results = results + "h";
    }
    else if ( input[i] == 't' )
    {
        results = results + "g";
    }
    else if ( input[i] == 'u' )
    {
        results = results + "f";
    }
    else if ( input[i] == 'v' )
    {
        results = results + "e";
    }
    else if ( input[i] == 'w' )
    {
        results = results + "d";
    }
    else if ( input[i] == 'x' )
    {
        results = results + "c";
    }
    else if ( input[i] == 'y' )
    {
        results = results + "b";
    }
    else if ( input[i] == 'z' )
    {
        results = results + "a";
    }
    return (results);
  }
}

void encryptDecrypt( string input, string output )
{
  ifstream in( input );
  ofstream out( output );

  string command;

  in >> results;
  in >> command;

  while ( !in.fail() )
  {
    if ( command == "encrypt" )
    {
      encrypt( input );
      out << "encrypted: " << results << endl;
    }
    else if ( command == "decrypt")
    {
      decrypt( input );
      out << "decrypted: " << results << endl;
    }
    in >> results;
    in >> command;
  }
}

and this is the header
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#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
using namespace std;

using std::string;
using std::ifstream;
using std::ofstream;
using std::endl;

void encryptDecrypt( string inputfile, string outputfile );
string encrypt( string input );
string decrypt( string input );

Could someone please advise on how to correct these errors.
Mar 2, 2017 at 11:26pm
jonnin (11491)
take the ; off of the function body def. It does not go there.

for example
string decrypt( string input ); <-------- this is your problem, remove it.
Last edited on Mar 2, 2017 at 11:27pm
Mar 3, 2017 at 12:10am
mayukhC (13)
I have corrected the errors but I am not getting any output.
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#include "encrypt.h"

string encrypt( string input )
{
  string results = "";
  for ( int i=0; i<input.length(); i++ )
  {
    if ( input[i] == 'a' )
    {
      results = results + "z";
    }
    else if ( input[i] == 'b' )
    {
        results = results + "y";
    }
    else if ( input[i] == 'c' )
    {
        results = results + "x";
    }
    else if ( input[i] == 'd' )
    {
        results = results + "w";
    }
    else if ( input[i] == 'e' )
    {
        results = results + "v";
    }
    else if ( input[i] == 'f' )
    {
        results = results + "u";
    }
    else if ( input[i] == 'g' )
    {
        results = results + "t";
    }
    else if ( input[i] == 'h' )
    {
        results = results + "s";
    }
    else if ( input[i] == 'i' )
    {
        results = results + "r";
    }
    else if ( input[i] == 'j' )
    {
        results = results + "q";
    }
    else if ( input[i] == 'k' )
    {
        results = results + "p";
    }
    else if ( input[i] == 'l' )
    {
        results = results + "o";
    }
    else if ( input[i] == 'm' )
    {
        results = results + "n";
    }
    else if ( input[i] == 'n' )
    {
        results = results + "m";
    }
    else if ( input[i] == 'o' )
    {
        results = results + "l";
    }
    else if ( input[i] == 'p' )
    {
        results = results + "k";
    }
    else if ( input[i] == 'q' )
    {
        results = results + "j";
    }
    else if ( input[i] == 'r' )
    {
        results = results + "i";
    }
    else if ( input[i] == 's' )
    {
        results = results + "h";
    }
    else if ( input[i] == 't' )
    {
        results = results + "g";
    }
    else if ( input[i] == 'u' )
    {
        results = results + "f";
    }
    else if ( input[i] == 'v' )
    {
        results = results + "e";
    }
    else if ( input[i] == 'w' )
    {
        results = results + "d";
    }
    else if ( input[i] == 'x' )
    {
        results = results + "c";
    }
    else if ( input[i] == 'y' )
    {
        results = results + "b";
    }
    else if ( input[i] == 'z' )
    {
        results = results + "a";
    }
    return (results);
  }
}

string decrypt( string input )
{
  string results = "";
  for ( int i=0; i<input.length(); i++ )
  {
    if ( input[i] == 'a' )
    {
      results = results + "z";
    }
    else if ( input[i] == 'b' )
    {
        results = results + "y";
    }
    else if ( input[i] == 'c' )
    {
        results = results + "x";
    }
    else if ( input[i] == 'd' )
    {
        results = results + "w";
    }
    else if ( input[i] == 'e' )
    {
        results = results + "v";
    }
    else if ( input[i] == 'f' )
    {
        results = results + "u";
    }
    else if ( input[i] == 'g' )
    {
        results = results + "t";
    }
    else if ( input[i] == 'h' )
    {
        results = results + "s";
    }
    else if ( input[i] == 'i' )
    {
        results = results + "r";
    }
    else if ( input[i] == 'j' )
    {
        results = results + "q";
    }
    else if ( input[i] == 'k' )
    {
        results = results + "p";
    }
    else if ( input[i] == 'l' )
    {
        results = results + "o";
    }
    else if ( input[i] == 'm' )
    {
        results = results + "n";
    }
    else if ( input[i] == 'n' )
    {
        results = results + "m";
    }
    else if ( input[i] == 'o' )
    {
        results = results + "l";
    }
    else if ( input[i] == 'p' )
    {
        results = results + "k";
    }
    else if ( input[i] == 'q' )
    {
        results = results + "j";
    }
    else if ( input[i] == 'r' )
    {
        results = results + "i";
    }
    else if ( input[i] == 's' )
    {
        results = results + "h";
    }
    else if ( input[i] == 't' )
    {
        results = results + "g";
    }
    else if ( input[i] == 'u' )
    {
        results = results + "f";
    }
    else if ( input[i] == 'v' )
    {
        results = results + "e";
    }
    else if ( input[i] == 'w' )
    {
        results = results + "d";
    }
    else if ( input[i] == 'x' )
    {
        results = results + "c";
    }
    else if ( input[i] == 'y' )
    {
        results = results + "b";
    }
    else if ( input[i] == 'z' )
    {
        results = results + "a";
    }
    return (results);
  }
}

void encryptDecrypt( string input, string output )
{
  ifstream in( input );
  ofstream out( output );

  string results;
  string command;

  in >> results;
  in >> command;
  while ( !in.fail() )
  {
    if ( command == "encrypt" )
    {
      string results = encrypt( input );
      out << "encrypted: " << results << endl;
    }
    else if ( command == "decrypt")
    {
      string results = decrypt( input );
      out << "decrypted: " << results << endl;
    }
  in >> results;
  in >> command;
  }
}


This is my new code.

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