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问题描述

我最近开始学习C ++,为了练习练习,我使用的是Microsoft Visual Studio。


我试图重新创建初始化-1的效果一个unsigned char(因此返回255)。然而,当编译代码时,它显示为未定义,警告我将int截断为unsigned char,并警告我正在截断常量值。


我得到了一个int不会提升到一个unsigned char,但是不应该认识到-1转换为255作为unsigned char吗?或者我错过了使用Visual Studio特有的东西?


调试时,我尝试为unsigned char做一个cout,但只显示一个空格。以下是cc

澄清的代码:


#include" stdafx.h"

#include< iostream>

使用命名空间std;


int main()

{

unsigned char c =' '-1'';

cout<< c<< endl;

返回0;

}

Hi, I''ve recently started studying C++ and in order to practice exercises I am using Microsoft Visual Studio.

I am attempting to recreate the effect of initializing -1 to an unsigned char (thus returning 255). When compiling the code however, it shows as undefined, warning that I am truncating an int into an unsigned char, as well as warning that I am truncating a constant value.

I get that an int does not promote up to an unsigned char, but shouldn''t the ide recognize that -1 converts to 255 as an unsigned char? Or am I missing something that is particular to using Visual studio?

When debugging, I try to do a cout for the unsigned char, but only a blank space shows. Here is the code for cc
clarification:

#include "stdafx.h"
#include <iostream>
using namespace std;

int main()
{
unsigned char c = ''-1'';
cout << c << endl;
return 0;
}

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10-29 20:30