Autofilling a variable in C++

[Ariachloe]

Hi!

I want to learn c++ and want to use binary numbers for my project. From Decimal to binary translation I have already a function, with ceros I want auto fill with 8 characters.
Example: 10 in decimal is converted as 1010, but I want it to be 00001010.

Set fill tool is not operating as I require the digit to be 8 numbers long for using it in other function.
Will any one help me? The code is here:

#include <iostream>
#include <cmath>

using namespace std;
int binario(int n);
int main(int argc, char *argv[]) {
	int n;
	cin>>n;
	int binn=binario(n);
	
	cout<<binn;
	return 0;
}

int binario(int n){
	int exp, digito;
	double binarion;	
	
	exp=0;
	binarion=0;
	while(n/2!=0&&exp<8)
	{
		digito = n % 2;
		binarion = binarion + digito * pow(10.0,exp);
		exp++;
		n=n/2;
	}
	binarion = binarion + n * pow(10.0,exp);
	return binarion;

Thanks.

[lastchance]

Use a std::string to contain your binary number, not an int.

[seeplus]

Based upon the OP algorithm, perhaps:

#include <iostream>
#include <iomanip>
#include <cmath>

int binario(int n) {
	int exp {}, binarion {};

	for (; n / 2 != 0 && exp < 8; n /= 2)
		binarion += (n % 2) * static_cast<int>(pow(10.0, exp++));

	return binarion + n * static_cast<int>(pow(10.0, exp));
}

int main() {
	int n {};

	std::cin >> n;
	std::cout << std::setw(8) << std::setfill('0') << binario(n) << '\n';
}

10
00001010

100
01100100

[lastchance]

#include <iostream>
#include <string>
using namespace std;

string binario( unsigned n );

int main()
{
   unsigned n;
   cout << "Enter an integer: ";
   cin >> n;
   cout << binario( n );
}

string binario( unsigned n )
{
   const int LENGTH = 8;
   string result;
   while ( n && result.size() < LENGTH )
   {
      result = "01"[n%2] + result;
      n /= 2;
   }
   return string( LENGTH - result.size(), '0' ) + result;
}

Actually, the following works quite well, too:

#include <iostream>
#include <string>
#include <bitset>
using namespace std;

string binario( unsigned n );

int main()
{
   unsigned n;
   cout << "Enter an integer: ";
   cin >> n;
   cout << binario( n );
}

string binario( unsigned n )
{
   return bitset<8>( n ).to_string();
}