C ++ 14 integer maximum/small value

C ++ 14 integer maximum/small value
Table of Contents1. how to obtain the maximum value 1.1. C ++ 14 method 1.2. How to achieve the maximum value 1.3 By yourself. How to Implement the minimum value 1 and how to obtain the maximum value 1.1 C ++ 14

Std: cout <"int \ t" <std: numeric_limits

 
  
: Lowest () <'\ t' <std: numeric_limits

  
   
: Max () <'\ n ';

  

 

Output result:

Int-21474836482147483647

1.2 How to achieve the maximum value by yourself

Int max_int = (int) (unsigned )~ 0> 1); cout <max_int <endl;

Output result:

2147483647

The results are the same. This line of code needs to be interpreted:

~ 0 is the inverse, and all bits are set to 1 (unsigned) transformation is to interpret the first from the left as a non-Signed bit, prepare for the next right shift> 1 is to shift one digit to the right (divided by 2). Because it is an unsigned integer, add 0 on the left and convert the result to the destination int type because there is no overflow, so we can certainly achieve the minimum value of 1.3.

Int min =-(int) (unsigned )~ 0> 1)-1;

Just add the symbol on the basis of the calculated maximum value and subtract one.

Author: dean

Created:

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