没有（标准）跨平台的方法来做到这一点。在Windows上，尝试使用 conio.h 。
它有：

  textcolor（）; // and 
 textbackground（）; 
 

功能。

/ p>

  textcolor（RED） 
 cprintf（H）; 
 textcolor（BLUE）; 
 cprintf（e）; 
 //等等。 
 

I want every character to be a different color.

for example,

cout << "Hello world" << endl;

• H would be red
• e would be blue
• l would be orange and so on.

I know this can be done, I just don't know the code for it.

and I want to change the background color to white. How would I do that?

There is no (standard) cross-platform way to do this. On windows, try using conio.h. It has the:

textcolor(); // and
textbackground();

functions.

For example:

textcolor(RED);
cprintf("H");
textcolor(BLUE);
cprintf("e");
// and so on.