// 十進制轉二進制 + (NSString *)toBinarySystemWithDecimalSystem:(NSString *)decimal{int num = [decimal intValue];int remainder = 0; //余數int divisor = 0; //除數NSString * prepare = @"";while (true){remainder = num%2;divisor = num/2;num = divisor;prepare = [prepare stringByAppendingFormat:@"%d",remainder];if (divisor == 0){break;}}NSString * result = @"";for (int i = prepare.length - 1; i >= 0; i --){result = [result stringByAppendingFormat:@"%@",[prepare substringWithRange:NSMakeRange(i , 1)]];}return result;} // 二進制轉十進制+ (NSString *)toDecimalSystemWithBinarySystem:(NSString *)binary{int ll = 0 ;int temp = 0 ;for (int i = 0; i < binary.length; i ++){temp = [[binary substringWithRange:NSMakeRange(i, 1)] intValue];temp = temp * powf(2, binary.length - i - 1);ll += temp;}NSString * result = [NSString stringWithFormat:@"%d",ll];return result; }

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