quicksort string array help c++ - c++

Question

This is my code. I don't know how to get the code to run. Im having problems with quicksorting for string.
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <time.h>
#include <string>
#include <ctime>
#include <stdio.h>
using namespace std;
int count;
template <class T>
void printArray(T ar[], int sz);
template <class T>
void bubbleSort(T ar[], int sz);
void quickSortMain(string items[], int ct);
void quickSort(string items[], int left, int right);
//////////////////////////////////////////////////////////////////////////
// Main Function Implementation
//////////////////////////////////////////////////////////////////////////
int main() {
int numOfData = 50000;
string line, temp;
ofstream resultFile;
ofstream tableFile;
double data[100][2];
string patient[numOfData];
ifstream dataFile("shufflePatient.txt");
int i;
int SIZE = 0;
cout << "Program to shuffle data" << endl << endl;
cout << "This program will calculate swapping processes and running time.";
/*Storing data*/
cout << "Reading data in process.." << endl;
if (dataFile.is_open()) {
i=-1;
while (dataFile.good()) {
getline (dataFile, line);
if (i>=0) patient[i] = line;
i++;
}
dataFile.close();
}
SIZE = 5;
quickSortMain(patient, 5);
/*Writing to file*/
cout << "Writing to file.." << endl;
resultFile.open ("test.txt");
for (int i=0 ; i<numOfData ; i++) {
resultFile << patient[i] << "\n";
}
resultFile.close();
system("pause");
return 0;
}
void quickSortMain(string items[], int ct)
{
quickSort(items, 0, ct-1);
}
void quickSort(string items[], int left, int right)
{
int i, j;
char *x;
string temp[10];
i = left;
j = right;
x = items[(left+right)/2];
do {
while((strcmp(items[i],x) < 0) && (i < right)) {
i++;
}
while((strcmp(items[j],x) > 0) && (j > left)) {
j--;
}
if(i <= j) {
strcpy(temp, items[i]);
strcpy(items[i], items[j]);
strcpy(items[j], temp);
i++;
j--;
}
} while(i <= j);
if(left < j) {
quickSort(items, left, j);
}
if(i < right) {
quickSort(items, i, right);
}
}
//----------------------------------------------------------------------------
// prints array of size size
//----------------------------------------------------------------------------
template <class T>
void printArray(T patient[], int size)
{
for(int i = 0; i < size; i++)
cout << patient[i] << " ";
cout << endl;
}
//----------------------------------------------------------------------------
// sorts array of size size by Bubble Sort method
//----------------------------------------------------------------------------
template <class T>
void bubbleSort(T patient[], int size) //returning an int
{
bool noChange = true;
for(int i = size; i > 0; i--)
{
noChange = true;
for(int j = 1; j < i; j++)
{
if(patient[j] < patient[j - 1])
{
swap(patient[j], patient[j-1]);
count = count + 1;
noChange = false;
}
}
if (noChange)
return ;
}
}
The error i got was in this line:
x = items[(left+right)/2];
I changed
char x*; to string x;
I don't know if that was correct. Now the error im getting is that strcmp and strcpy are not declared. Any help on what i should do next?

Answer 1

That's correct, now change
strcmp(items[i],x) < 0
to
items[i] < x
and
strcmp(items[j],x) > 0
to
items[j] > x
and
strcpy(temp, items[i]);
to
temp = items[i];
etc.
But really this is a case of RTFM. If you're competent enough to write a quicksort routine you should be competent enough to look up how std::string works. Being able to access reference information is a very important skill for a programmer.