parsing NSString to Double

Question

so I want to convert NSString to double. I found the following example:

NSString * s = @\"1.5e5\";
NSLog(@\"%lf\", [s doubleValue]);


        

Answer 1

You can use the NSScanner class:

NSString *s = @"1.5e5";
NSScanner *scanner = [NSScanner scannerWithString:s];
double d;
BOOL success = [scanner scanDouble:&d];

If you want to ensure that the entire string has been scanned (no extra characters after the number), use

BOOL isAtEnd = [scanner isAtEnd];