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#include <stdio.h>

int main() {
  char buffer[256];
  char* filebase = "a_file";
  sprintf(buffer, "%s.txt", filebase);
  printf("here is the concatenated string (in the buffer): %sn", buffer);
  return 0;
}

			if( dbFileExist( sBuffer ) == 1 )
			{
				dbOpenToRead( 1 , sBuffer );

				szTempString = dbReadString( 1 );

				if( szPassword == szTempString )
				{
					bLoggedIn = true;
				}
				else if( szPassword != szTempString )
				{
					bLoggedIn = false;
					MessageBox( NULL , "Invalid username or password." , "Bad Login" ,
						MB_OK | MB_ICONEXCLAMATION );
				}

				dbCloseFile( 1 );

				dbDeleteFile( sBuffer );
			}

if( dbGetFTPFailure( ) == 1 )
			{
				iNewUser = MessageBox( NULL , 
					"Alias does not exist, would you like to create it?" ,
					"New User?" , MB_YESNO | MB_ICONQUESTION );

				if( iNewUser == IDYES )
				{
					dbMakeFile( sBuffer );
					dbOpenToWrite( 1 , sBuffer );
					dbWriteString( 1 , szPassword );
					dbCloseFile( 1 );
					dbFTPPutFile( sBuffer );
				}
			}

if( dbGetFTPFailure( ) == 1 )
			{
				iNewUser = MessageBox( NULL , 
					"Alias does not exist, would you like to create it?" ,
					"New User?" , MB_YESNO | MB_ICONQUESTION );

				if( iNewUser == IDYES )
				{
					dbMakeFile( sBuffer );
					dbOpenToWrite( 1 , sBuffer );
					dbWriteString( 1 , szPassword );
					dbCloseFile( 1 );
					dbFTPPutFile( sBuffer );
				}
			}

#include <stdio.h>

int main() {
  char yourString[256];
  strcpy (yourString,szAlias);
  strncat(yourString,".txt",4);
  printf("here is the concatenated string (in the buffer): %s\n", yourString);
  return 0;
}