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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