// Textreadwrite.cpp : main project file.#include "stdafx.h"#include <string>#include <vector>#include <iostream>#include <fstream>#include <sstream>#include <cmath>#include <cstdlib>using namespace std;float** ReadTable(const char* FileName, int& RowNum, int& ColNum) { string line; ifstream in_stream(FileName); ofstream out_stream; // Determine number of rows and columns in file // Program halts if rows are not of same length******************Doesn't Work******************* while(getline(in_stream,line,'\n')) { string segments; int ColsPerRow = 0; // Initialize counter stringstream ss; ss << line; while (getline(ss,segments,'\t')) { ColsPerRow++; } if (RowNum == 0) { // Define number of columns in file as the number // of columns in the first row. ColNum = ColsPerRow; } else { if (ColsPerRow != ColNum) { cerr << "Row " << RowNum << " is not the same length " "as row 0." << endl; exit(0); } } RowNum++; } // Declare arrays for storing and accessing // data from the file. float** pa2d = new float*[RowNum]; float* parr = new float[RowNum*ColNum]; // Reposition to start of stream buffer. in_stream.clear(); in_stream.seekg(0, ios::beg); // Write data to array: for (int i = 0; i < (RowNum*ColNum); i++) { // Declarations. float in_float; char in_char; string in_s; stringstream in_ss; // Insert data entry into stringstream. in_stream >> in_s; in_ss << in_s; // Convert data entry to float. in_ss >> in_float; } // Prepare 2D array to be returned. // Define pointer position at start of each row. for (int i = 0; i < RowNum; i++) { pa2d[i] = parr + (i*ColNum); } return pa2d;}void PrintMatrix(float** matrix, const int RowNum, const int ColNum) { // Print "matrix" to console. cout << '\n'; for (int i=0; i < RowNum; i++) { for(int j=0; j < ColNum; j++) { cout << (j?"\t":"") << matrix[i][j]; // Don't insert tab before first element of each row. } cout << '\n'; }}void OutPut(float** matrix, const int RowNum, const int ColNum) { //Print matrix to text file ofstream out_stream; out_stream.open("outfile.dat"); // open (connect) output file stream if (out_stream.fail()) { cout << "Output file opening failed.\n"; cout << '\n'; } for (int i=0; i < RowNum; i++) { for(int j=0; j < ColNum; j++) { out_stream << (j?"\t":"") << matrix[i][j]; // Don't insert tab before first element of each row. } out_stream << '\n'; }}int main() { // Define input filename. const char* FileName = "test3.txt"; // Initialize row and column counters. int RowNum = 0; int ColNum = 0; // Perform reading of data file into 2D array. float** data = ReadTable(FileName,RowNum,ColNum); PrintMatrix(data,RowNum,ColNum); OutPut(data,RowNum,ColNum); system ("pause"); return(0);}
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