Updating one part of the output (C++ / Cout)

I was just wondering how some programs update certain parts of the terminal output.... Like when showing the percentage done. Its hard to explain...

Like if the output was this:

Code:

---

Percentage: [number]

---

Where [number] was continuously updated.

How is that done?:confused:

Thanks

This code will do what you're asking for, however, I have only tested it in windows. Its behavior may be different under linux/mac.

Code:

---

#include <iostream>
using std::iostream;
 
int main()
{
    for (int i=0; i < 5; i++)
        cout << "Progress: " << i*25 << "%\r";
 
     return 0;
}

---

Shouldn't it be:

Code:

---

cout << "\rProgress: " << i*25 << "%";

---

?

I guess the difference is minimal... Oh, and don't forget to flush the output or you'll see nothing.

For completions sake:

Code:

---

#include <iostream>
using namespace std;
 
int main() {
        for (uint i = 0; i <= 100; ++i) {
                cout << "\rProgress: " << i << "%" << flush;
                for (uint j = 0; j < 9999999; ++j); // pause
        }
 
        cout << endl;
 
        return 0;
}

---

\r means carriage return. Without a \n, it just takes the cursor back to the beginning of the current line. flush flushes the buffer.

Alright, thanks all.... Its nice to fill in one of those little gaps of knowledge. :)