Question

I made a simple calculator and Everytime I hit calculate it’ll give a an answer but gives six unnecessary zeros, my question, how can I remove those zeros?

NSString *firstString = textfieldone.text;
NSString *secondString = textfieldtwo.text;

NSString *LEGAL = @"0123456789";
NSCharacterSet *characterSet = [[NSCharacterSet characterSetWithCharactersInString:LEGAL] invertedSet];
NSString *filteredOne = [[firstString componentsSeparatedByCharactersInSet:characterSet] 
                         componentsJoinedByString:@""];
NSString *filteredTwo = [[secondString componentsSeparatedByCharactersInSet:characterSet] 
                         componentsJoinedByString:@""];
firstString = filteredOne;
secondString = filteredTwo;

//Here we are creating three doubles
double num1;
double num2;
double output;
//Here we are assigning the values 
num1 = [firstString doubleValue];
num2 = [secondString doubleValue];

output = num1 + num2;

label.text = [NSString stringWithFormat:@"%f",output];

Example:

15 + 15 = 30.000000

Answer 1

If you’re displaying this by using a string, check the following approaches.

NSString

NSString * display = [NSString stringWithFormat:@"%f", number];
//This approach will return 30.0000000

NSString * display = [NSString stringWithFormat:@"%.2f", number];
//While this approach will return 30.00

Note: You can specify the number of decimals you want to return by adding a point and a number before the ‘f’

-Edited-

In your case use the following approach:

label.text = [NSString stringWithFormat:@"%.0f", output];
//This will display your result with 0 decimal places, thus giving you '30'