How to write an usigned value to file accurately

[WeeBeng]

I understand that I only need seed a random number generator once to get a good set of random numbers.
Actually I want to keep seeding the random number generator with the same seed because I want the use the same set of random numbers generated as data to test different sets of functions I have written and compare their results. As the programme will run for a long time for each function, it is preferable that I actually run them at different times using the same data.

Thanks for all the help . Finally managed to get what I want .
Sample working code as follows in case anybody wants to do a similar thing in future.

void appendfile(unsigned number)
{

	FILE *cfPtr;

	if ((cfPtr= fopen("c:\\updx","wb"))== NULL )
		printf ("File could not be opened\n");
	else{
			fwrite(&number, sizeof(number), 1, cfPtr);

		}

		
	fclose(cfPtr);

}

unsigned readfile( char *string)
{

	FILE *cfPtr;
	unsigned number;

	if ((cfPtr= fopen(string,"rb"))== NULL )
		printf ("File could not be opened\n");
	else{

		fread(&number,sizeof(number),1,cfPtr);
	}
			
	fclose(cfPtr);

	return number;

}