Limit Characters in Double

How can I make a double appear with only two decimal places? Current code is as follows (but of course, it's showing a lot of decimal places):

    tipPercentDbl = 20;//tipPercent as Dbl
    tipDbl = (totalDbl * (tipPercentDbl/100));//tip as Dbl
    tip.text = [NSString stringWithFormat:@"%f", tipDbl];
    tipPercent.text = [NSString stringWithFormat:@"%f", tipPercentDbl];
    totalWithTipDbl = (totalDbl+tipDbl);
    totalWithTip.text = [NSString stringWi开发者_StackOverflowthFormat:@"%f", totalWithTipDbl];

Change this

tipPercent.text = [NSString stringWithFormat:@"%f", tipPercentDbl];

to this

tipPercent.text = [NSString stringWithFormat:@"%.2f", tipPercentDbl];

You want %.2f:

tip.text = [NSString stringWithFormat:@"%.2f", tipDbl];
tipPercent.text = [NSString stringWithFormat:@"%.2f", tipPercentDbl];
// ...
totalWithTip.text = [NSString stringWithFormat:@"%.2f", totalWithTipDbl];

Format specifiers take the form of:

%[flags][width][.precision][length]specifier 

where .precision in the case of f specifiers means the number of digits to be printed after the decimal point.