GetLine Function For C-String Not Working Properly - c++

Question

I'm working on a project for my computer science class, and for whatever reason, once my code gets to my cin.getline code it just ends and doesn't allow me to enter anything in and I don't know why. I think the problem has something to do with the "null" character at the end of a c-string, but I'm not quite sure as it was working fine until I added the "Determining Whether to CODE or DECODE section" and the if statement. This code isn't fully complete yet, I just need to fix whatever is causing this to move on though.
So essentially, it works without the whole section above it and the if statement. But once I add those, my cin.getline function doesn't work. However, if I do a cin >> line, it will work even with the code above it. I need the getline function because I will be writing it to a file, and I also need to grab those sexy spaces ' '.
#include <iostream>
#include <cstring>
#include <string>
#include <ctime>
#include <fstream>
using namespace std;
//Function Prototypes:
string fileAddress(string);
void swap(char &, char &);
string code(int, char [], char [], char []);
//Main Function:
int main()
{
//Alphabet Section:
//------------------------------------------------------------------------------------------------------------------
//Declaring Variables Relating to Alphabet:
int size = 29;
char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ., ";
char sAlphabet[size];
int x;
int y;
//Copying Alphabet & Outputting Test Value:
strcpy(sAlphabet, alphabet);
//Scrambling Alphabet
unsigned seed = time(0);
srand(seed);
for(int i = 0; i < 10000; i++)
{
//Initializing Random Numbers to Swap:
x = rand()%29;
y = rand()%29;
//Swapping Values
swap(sAlphabet[x], sAlphabet[y]);
}
//Testing Scrambled Alphabet:
cout << sAlphabet << endl << endl;
//------------------------------------------------------------------------------------------------------------------
//Determining Whether to CODE or DECODE Section:
//------------------------------------------------------------------------------------------------------------------
//Response Variables:
string response;
//Gathering Choice From User:
cout << "If you wish to code a message, please type CODE." << endl;
cout << "If you wish to decode a message, please type DECODE.";
cin >> response;
//------------------------------------------------------------------------------------------------------------------
//Writing Coded Message to File Section:
//------------------------------------------------------------------------------------------------------------------
if(response == "CODE")
{
//Code Variables:
int length = 100;
char line[length];
char cline[length];
string codedLine;
//Gathering Line from User:
cout << "Please enter a message in all CAPS that you wish to code.";
cin.getline(line, length);
//Copying Line:
strcpy(cline, line);
//Gathering length of Line:
length = strlen(line);
codedLine = code(length, line, cline, sAlphabet);
cout << line << endl;
cout << codedLine<< endl;
}
else
cout << "You suck";
return 0;
}
//Creating Swap Function:
void swap(char &value1, char &value2)
{
char temp;
temp = value1;
value1 = value2;
value2 = temp;
}
string code(int length, char line[], char cline[], char sAlphabet[])
{
for(int i = 0; i < length; i++)
{
//Letter A:
if(line[i] == 'A')
{
cline[i] = sAlphabet[0];
}
//Letter B:
else if(line[i] == 'B')
{
cline[i] = sAlphabet[1];
}
//Letter C:
else if(line[i] == 'C')
{
cline[i] = sAlphabet[2];
}
//Letter D:
else if(line[i] == 'D')
{
cline[i] = sAlphabet[3];
}
//Letter E:
else if(line[i] == 'E')
{
cline[i] = sAlphabet[4];
}
//Letter F:
else if(line[i] == 'F')
{
cline[i] = sAlphabet[5];
}
//Letter G:
else if(line[i] == 'G')
{
cline[i] = sAlphabet[6];
}
//Letter H:
else if(line[i] == 'H')
{
cline[i] = sAlphabet[7];
}
//Letter I:
else if(line[i] == 'I')
{
cline[i] = sAlphabet[8];
}
//Letter J:
else if(line[i] == 'J')
{
cline[i] = sAlphabet[9];
}
//Letter K:
else if(line[i] == 'K')
{
cline[i] = sAlphabet[10];
}
//Letter L:
else if(line[i] == 'L')
{
cline[i] = sAlphabet[11];
}
//Letter M:
else if(line[i] == 'M')
{
cline[i] = sAlphabet[12];
}
//Letter N:
else if(line[i] == 'N')
{
cline[i] = sAlphabet[13];
}
//Letter O:
else if(line[i] == 'O')
{
cline[i] = sAlphabet[14];
}
//Letter P:
else if(line[i] == 'P')
{
cline[i] = sAlphabet[15];
}
//Letter Q:
else if(line[i] == 'Q')
{
cline[i] = sAlphabet[16];
}
//Letter R:
else if(line[i] == 'R')
{
cline[i] = sAlphabet[17];
}
//Letter S:
else if(line[i] == 'S')
{
cline[i] = sAlphabet[18];
}
//Letter T
else if(line[i] == 'T')
{
cline[i] = sAlphabet[19];
}
//Letter U:
else if(line[i] == 'U')
{
cline[i] = sAlphabet[20];
}
//Letter V:
else if(line[i] == 'V')
{
cline[i] = sAlphabet[21];
}
//Letter W:
else if(line[i] == 'W')
{
cline[i] = sAlphabet[22];
}
//Letter X:
else if(line[i] == 'X')
{
cline[i] = sAlphabet[23];
}
//Letter Y:
else if(line[i] == 'Y')
{
cline[i] = sAlphabet[24];
}
//Letter Z:
else if(line[i] == 'Z')
{
cline[i] = sAlphabet[25];
}
//Character Period:
else if(line[i] == '.')
{
cline[i] = sAlphabet[26];
}
//Character Comma:
else if(line[i] == ',')
{
cline[i] = sAlphabet[27];
}
//Character Space:
else if(line[i] == ' ')
{
cline[i] = sAlphabet[28];
}
else
cout << "Error" << endl;
}
return cline;
}
The output should be allowing myself to write in the line of code and see it back scrambled, which the scrambler works.

Answer 1

I fixed it using the ignore function for the \n character found in the thread that R Sahu posted.
I basically just added:
cin.ignore(std::numeric_limits::max(), '\n')
before my cin.getline.