How do you convert a character to its binary value?

I want to make a program that does this, but I need to know how to do this first. Also, how would you make a loop that goes through a string and converts all the characters?

This to loop through each character in a string:

Code:

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void main() {
    string sSrc = "Hello World!";

    for(int i = 0; i < sSrc.length(); i++) {
        string sRes = Convert(sSrc[i]);
        cout << sRes << endl;
    }
}

string Convert(char cChar) {
    // Do what you want to it in this function
    char pcBuf[9];

    for(int i = 0; i < 8; i++) {
        pcBuf[i] = ((cChar >> (8-i)) & 0x1) + '0';
    }

    pcBuf[9] = 0;

    return string(pcBuf);
}

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Not totally sure on the binary conversion there (didn't have chance to test it). If the numbers are the wrong way round just change the (8 - i) in Convert.

Can you please tell me what headers I need to include? I am getting three errors that I can't seem to getr rid of, I will post them it is helps you at all.

Code:

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#include <iostream>
#include <string>

using namespace std;

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