Create a shapefile from a text file with XY values
CreateShapeFromText.h
// Copyright 2010 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See the use restrictions.
// 

 
#include <iostream>
#include <fstream>
#include <iomanip>
#include <ArcSDK.h>
#include "LicenseUtilities.h"

// Function prototypes
HRESULT CreateShapefile(char *outPath, char *outName, IFeatureClass **ipShape);
HRESULT AddPoints(std::ifstream &inFile, IFeatureClass *ipShape, bool useFeatureBuffer);
void Usage(void);