in c# i can use System.String.Format() to deal with relative actions,and it's so convenient,
but in c++ i can't find some way to do the same thing?
although i can do it by myself, i just want to know is there some api to do this.
in my scenario, i bind a textblock with a double, and want to show two number after the decimal dot,but sometimes when the number is some like 10.20, it just shows 10.2, so i want to format it to 10.20.