#import <Foundation/Foundation.h>

NSDecimalNumber* invertDecimalNumber(NSDecimalNumber *x, int *count) {
    if ( *count > 0 ) {
        x = [[NSDecimalNumber one] decimalNumberByDividingBy:x];
        *count -= 1;
        return invertDecimalNumber( x, count );
    } else {
        return x;
    }
}

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        for ( int c = 0; c <= 4 ; c += 2 ) {
            NSLog(@"");
            for ( int e = 15; e <= 42; e++ ) {
                NSString *xStr = [NSString stringWithFormat:@"7e+%d", e];
                int r = c;
                NSLog(@"x=%5@, after %d inverts=%22@", xStr, r, invertDecimalNumber( [NSDecimalNumber decimalNumberWithString:xStr], &r ));
                //NSLog(@"x=%5@, after %d inverts=%22@", xStr, r, invertDecimalNumber( [NSDecimalNumber decimalNumberWithMantissa:7 exponent:e isNegative:NO], &r ));
            }
        }
    }
    return 0;
}