cout不打印unsigned char [英] cout not printing unsigned char

问题描述

我正在处理以下代码：

#include<iostream>
#include<stdio.h>

using namespace std;

main() {
    unsigned char a;
    a=1;
    printf("%d", a);
    cout<<a;
}

正在打印1和一些垃圾。

It is printing 1 and some garbage.

为什么 cout 表现如此？

推荐答案

cout< a 正在打印一个看起来是垃圾的值。它实际上不是垃圾。它只是一个不可打印的 ASCII字符，无论如何它仍然打印。请注意，对应于 1 的ASCII字符是不可打印的。您可以检查 a 是否可以打印， std :: isprint as：

cout << a is printing a value which appears to be garbage to you. It is not garbage actually. It is justa a non-printable ASCII character which is getting printed anyway. Note that ascii character corresponding to 1 is non-printable. You can check whether a is printable or not using, std::isprint as:

std::cout << std::isprint(a) << std::endl;

它将打印 0 code> false ）表示字符不可打印

It will print 0 (read: false) indicating the character is non-printable

-

无论如何，如果你也希望 cout 打印 1 到此：

Anyway, if you want your cout to print 1 also, then cast a to this:

cout << static_cast<unsigned>(a) << std::endl;

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