Formatting a file name using user input.

fileName.cpp

#include <sstream>

#define IMAGE_FILE_PATH		"../../data/WideAngle"			
#define LEFT_IMAGE_FILE_PATH	"../../data/WideAngle"	

#define LEFT_PREFIX		"left_"
#define RIGHT_PREFIX		"right_"

#define IMG_NUM_PAD		(4)
#define IMG_EXTENSION		"bmp"

#define START_FRAME_NUM		(1)
#define END_FRAME_NUM		(10)

using namespace std;

string ZeroPadNumber(int num, int pad){

	stringstream ss;

	// The number is converted to string with the help of stringstream
	ss << num; 
	string ret;
	ss >> ret;

	if(pad < 1){
		return ret;
	}else{
		// Append zero chars
		int str_length = ret.length();
		for (int i = 0; i < pad - str_length; i++)
			ret = "0" + ret;
		return ret;
	}	
}

int main(void){
 
  char szFilePath[512];
  for(int i=START_FRAME_NUM; i<=END_FRAME_NUM; i++) {
    sprintf(szFilePath, "%s/%s%s.%s", LEFT_IMAGE_FILE_PATH, LEFT_PREFIX, ZeroPadNumber(i, IMG_NUM_PAD).c_str(), IMG_EXTENSION);
    printf("%s\n", szFilePath);
    sprintf(szFilePath, "%s/%s%s.%s", RIGHT_IMAGE_FILE_PATH, RIGHT_PREFIX, ZeroPadNumber(i, IMG_NUM_PAD).c_str(), IMG_EXTENSION);
    printf("%s\n", szFilePath);
  }
  
  return 0;
}