How to convert binary number to 8 bits

Hye..good day everyone..i need some help here..i have converted decimal number to binary number..but i have a problem..could someone help me on how to make the binary number to 8 bits only...

thank u for ur help~!!

Code:

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#include <conio.h>
#include <iostream>
using namespace std;

void convertBinary( int n ) {
if( n<2 ) {
cout<<"binary is--> "<<n;
return;
}
convertBinary(n/2);
cout<<n % 2;
}

int main(){
    int n;
    int x;
   
    cout<<"n:";
    cin>>n;
    convertBinary( n );
   
  getch();
  return 0;
}

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1) Read in an unsigned int, not a signed int.
2) Truncate it to the range 0-255.