Variable interpolation inside printf-style formatting functions

Question

Is there a way to pass a variable for the floating point precision parameter in printf-style string formatting functions in Objective-C (or even C)? For example, in TCL and

Answer 1

Yes, the string format specifiers for printf, which are used by Cocoa for formatting, include a variable-precision specifier, * placed after the decimal point:

int precision = 3;
NSLog(@"%.*f", precision, 3.14159);
NSString *myString = [NSString stringWithFormat:@".*f", precision, 3.14159];