Compiler won't take my cin

When I compile this:

Code:

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#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;
using std::cin;

int main(int arcg, char *arvg[]) {
char* coda; 
char* wait;
ofstream outFile("message1.cod", ios::out);   
    for(;;){
            cin<<coda;
            if(coda == "a")
            wait=("Z");
            else if(coda == "b")
            wait=("Y");
            else if(coda == "c")
            wait=("X");
            else if(coda == "d")
            wait=("W");
            else if(coda == "e")
            wait=("V");
            else if(coda == "f")
            wait=("U");
            else if(coda == "g")
            wait=("T");
            else if(coda == "h")
            wait=("S");
            else if(coda == "i")
            wait=("R");
            else if(coda == "j")
            wait=("Q");
            else if(coda == "k")
            wait=("P");
            else if(coda == "l")
            wait=("O");
            else if(coda == "m")
            wait=("N");
            else if(coda == "n")
            wait=("M");
            else if(coda == "o")
            wait=("L");
            else if(coda == "p")
            wait=("K");
            else if(coda == "q")
            wait=("J");
            else if(coda == "r")
            wait=("I");
            else if(coda == "s")
            wait=("H");
            else if(coda == "t")
            wait=("G");
            else if(coda == "u")
            wait=("F");
            else if(coda == "v")
            wait=("E");
            else if(coda == "w")
            wait=("D");
            else if(coda == "x")
            wait=("C");
            else if(coda == "y")
            wait=("B");
            else if(coda == "z")
            wait=("A");
            else
            break;
outFile<<wait<<endl;
            }
cout<<"Message status, SENT"<<endl;
outFile.close();
}

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I get an error that says this:

Quote:

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Originally Posted by Dev-C++_Compiler

no match for 'operator<<' in 'std::cin << coda'

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Why is it doing that?

because << should be >> for cin

Think of the >> or << telling you where the information is going

cin >> bob
The information is coming from cin and going to bob

cout << bob
The information is coming from bob and going to cout

> char* coda;
You'll be better off with char coda[100]; to save you trashing some space which you don't own.

> if(coda == "a")
And these need to be strcmp() calls as well.

Sorry it was so stupit, I allready knew that, I just didn't catch it this time.

Quote:

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> char* coda;
You'll be better off with char coda[100]; to save you trashing some space which you don't own.

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Or the good ol' std::string ;)

Or a single char, since that seems to be all you're reading. If you do that, you can also forego the endless if-else chain and do some trickery with the character values. (Although, admittedly, that makes you unportable to systems that don't use a continuous-alphabetics character set, like I believe EBCDIC is.)

Specifically, you could write:

Code:

---

char coda, write;
for(;;) {
  cin >> coda;
  if(coda < 'a' || coda > 'z') {
    break;
  }
  wait = 'A' + ('z' - coda);
}

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Intersting way to do it.

hmm couldn't you use:

Code:

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char coda, write;
for(;;) {
  cin >> coda;
  if ( islower( static_cast<unsigned char>(coda) ) )
    write = toupper( static_cast<unsigned char>(coda) ) ;
  else
    break;
  outFile<<wait<<endl;
}

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Now you get the same affect and you aren't using implmentation specific details

Quote:

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Originally Posted by Thantos

hmm couldn't you use:

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No, because he assigns 'Z' for 'a', 'Y' for 'b', ...
Your code assigns 'A' for 'a'.

opps! Just gave his code a glance over.