Jonathan Thurft - 2 months ago 10
Objective-C Question

# Transform inches to centimeters and viceversa

I am quite new to objective-c.

I am trying to create a function that takes inches or centimetres and transform the values into the oposite metric system.

I am currently struggling on how to do a mathematical equation in objective-c given that I do not know how to set the variables accordingly. As I always get some error from XCode saying that the variable is an int but shouldn't be or the pointer is wrong and other things... basicaly... i dont know how to make math...

The intention is that I pass the string

`5’11”`
or
`1.80 cm`
as stored somewhere else and convert it to the opposite metric system.

The code below attempts to do pass inches to cm.... if we pass 5’5” the mathematical equation should be
`((5 * 12) + 3) * 2.54`
this is equal to
`180.34`
and the formated result that i look from the function is
`1.80 cm`

The following code is a far as I got but it just not working for me. if anyone could please tell me how to do this operation in my code I would appreciate it.

``````- (NSString *)returnRightMetric:(NSString *)theMeasure typeOfMetricUsed:(NSString *)metricType
{
if ([metricType isEqualToString:@"inches"]) {

NSArray* theConvertion = [theMeasure componentsSeparatedByCharactersInSet:
[NSCharacterSet characterSetWithCharactersInString:@"’”"]];
NSInteger* value1 = [theConvertion[0] intValue];
NSInteger* value2 = [theConvertion[1] intValue];

float *number = ((value1 * 12) + value2) * 2.54;
///.....

} else if ([metricType isEqualToString:@"cm"])
{
}

return result;
}
``````

``````NSArray* theConvertion = [theMeasure componentsSeparatedByCharactersInSet: