Printf function tips: Use variables to control the width

I saw a post on chinaunix about the printf function, that is, using variables to control the output width.

This is a good technique. It may not be useful in the future. Haha

Original post address: http://bbs.chinaunix.net/viewthread.php? Tid = 1327871

I have summarized it myself. Let's take a look at the example:
# Include <stdio. h>

Int main ()
{
Int a1 = 55;
Int a2 = 99;
Int B = 10;
Printf ("% * D % * d \ n", B, A1, B, A2 );
Return 0;
}

As you can see, % d can be used to control the output width by adding * in the middle. That is, B is used to control the width!