Nsnumber checking digits after floating point

Question

I am constructing NSNumber object from a float value.NSNumber *start =[NSNumber numberWithFloat:[self obj.value]];

This gives me start value for example

14.85

I want to do couple of things here, firstly I want to extract the digits after decimal point. In this case 85, I want to assign 85 to a temp object. Then i will perform following check on this newly created temp object.

if (temp >=30){
start = 14.30;
}
else start== 14.0 ;

I have an idea with simple float numbers in C I could achieve this as follows

if ((res-(int)res>=30))
        res= (int)res +.30;
        else res = (int)res;

Answer 1

Here you have an example of how you could do it simple:

NSNumber *start = [NSNumber numberWithFloat:14.85];
float startFloat = [start floatValue];
int startInt = [start intValue];
int decimalPart =  (startFloat - startInt) * 100 ;

if (decimalPart >= 30){
    NSLog(@"------------- decimalPart >= 30");
    NSLog(@"------------- Do something");

}
else {
    NSLog(@" ------------- decimalPart < 30");
    NSLog(@"------------- Do something");
}