iosobjective-cnsstringformat-specifiersstringwithformat

How to not show unnecessary zeros when given integers but still have float answers when needed

I have an app I'm developing and one of my features is giving answers in float or double values when needed and an integer when the answer is a whole number

so for example if the answer comes out to 8.52 the answer becomes 8.52 but when the answer is 8 the answer is 8 instead of 8.0000, i don't want it to show all the extra 0s. 

- (IBAction) equalsbutton {
NSString *val = display.text;
switch(operation) {

    case Plus :
        display.text= [NSString stringWithFormat:@"%qi",[val longLongValue]+[storage longLongValue]];

    case Plus2 :
        display.text= [NSString stringWithFormat:@"%f",[val doubleValue]+[storage doubleValue]];

this code doesn't seem to work

Solution

  • These specifiers are standard IEEE format specifiers, which means that you can do things like %.2f to only show 2 decimal places on a float variable.

    You could also convert it into an int, and then use the %d format specifier if you wanted to do it that way.

    Here's also Apple's documentation on the subject.

    EDIT: Based on your comment on the other post, it looks like you're looking for %g, which will essentially remove the extraneous 0's from floats.

    display.text= [NSString stringWithFormat:@"%g",[val doubleValue]+[storage doubleValue]];

    I found the answer here: Use printf to format floats without decimal places if only trailing 0s