Convert string value into float value

How do I convert a string to a float in Objective-C?

I am trying to add a couple of strings I am getting back from XML:

float subTotal = [[[[pintsary objectAtIndex:i]objectForKey:@"Price"] floatValue];

NSLog(@"%@",subTotal));开发者_开发知识库

but it gives error

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NSLog(@"%@",subTotal);

is wrong: You want to print a float value, not an object. Use %f instead.