Thread: How many chars does it take to fill up 1 megabyte?

How many chars(i.e. A) does it take to fill up 1 megabyte?

It depends on your system, but on most platforms a char is 1 byte.

Originally Posted by SlyMaelstrom

Just a tip for you, a new programmer...

Code:

std::cout<<"To select Secure Disk Wipe, input SDW.\n";
std::cout<<"To select Secure Disk Cleanse, input SDC.\n";

...these are not operations you want to be messing around with until you're very familiar to programming.

I am making my own way, if you take a look at the selections, I am using my own method of Cleansing the disk and I am going to figure out a way to (safely) wipe it.

Code:

#include <fstream>
#include <iostream>
#include <windows.h>
int main()
{
	std::string File,Option;
	int Loop,SizeOfDisk,SizeOfFile,OrigSizeOfFile;
	Loop=1;
	std::cout<<"Welcome to C.J.'s Security 'suite'!\n";
	std::cout<<"Please enter what you want to do.\n";
	std::cout<<"To select Secure Disk Wipe, input SDW.\n";
	std::cout<<"To select Secure Disk Cleanse, input SDC.\n";
	std::cout<<"To select Secure File Deletion, input SFD.\n";
	std::cout<<"To select ---this option is not yet available---.\n";
	std::cout<<"To select ---this option is not yet available---.\n";
	std::cout<<"Option:";
	getline(std::cin,Option,'\n');
	if(Option=="SDW")
	{
	    std::cout<<"Sorry,This option is not yet available";
	    std::cin.get();
	}    
	if(Option=="SDC")
	{
		std::cout<<"Please enter Disk letter(Only letter):";
		getline(std::cin,File,'\n');
		if(File.length()!=2)
		{
			while(Loop==1)
			{
				File="";
				std::cout<<"\nPlease enter Disk Letter Only:";
				getline(std::cin,File,'\n');
				if(File.length()==2)
				{
					Loop=0;
				}
			}
			Loop=1;
		}       
		File=File+":\\SecureDiskCleanse.txt";
		std::ofstream a_file(File.c_str());
		while(Loop==1)
		{
			a_file<<"Secure Disk Cleanse.";
			/*CheckSizeOfDisk*/
			if(SizeOfDisk==0)
			{
				Loop=0;
			}
		}
		a_file.close();
		File="DEL "+File;
		system(File.c_str());
		std::cin.get();
	}
	if(Option=="SFD")
	{
		std::cout<<"Please enter file path and name.:";
		getline(std::cin,File,'\n');
		/*GET ORIGINAL SIZE OF FILE*/
		std::ofstream a_file(File.c_str(), std::ios::trunc);
		while(Loop==1)
		{
			a_file<<"Secure File Deletion.";
			/*GET SIZE OF FILE*/
			if(SizeOfFile>(OrigSizeOfFile+10))
			{
				Loop=0;
			}    
		}
		a_file.close();
		File="DEL "+File;
		system(File.c_str());
		std::cin.get();
	}
	else
	{
	    std::cin.get();
	}
	return 0;
}

I know ^_^ Thanks for your warning though. I am putting in error checking to make shure that the input is legit...

>>but I don't think the standard guarantees it is always one byte in size

Yes, the standards say one character = 1 byte. But does not say how may bits make up that byte. I've heard there are some 4-bit operating systems, where 1 byte = 4 bits. But there are also 128-bit operating systems where 1 byte = 128 bits. And in the next year or so MS-Windows will be a 64-bit operating system where 1 byte = 64 bits.

Just use this program

Code:

#include <iostream>

using namespace std;

int main()

{
cout << "The size of an int is:\t\t"    << sizeof(int)    << " bytes.\n";
cout << "The size of a short int is:\t" << sizeof(short)  << " bytes.\n";
cout << "The size of a long int is:\t"  << sizeof(long)   << " bytes.\n";
cout << "The size of a char is:\t\t"    << sizeof(char)   << " bytes.\n";
cout << "The size of a float is:\t\t"   << sizeof(float)  << " bytes.\n";
cout << "The size of a double is:\t"    << sizeof(double) << " bytes.\n";

cin.get();
}

Well, how can I check the free space on a harddrive and the size of particular files???