为什么在标准输出的末尾出现％百分比，但在使用endl时却没有呢？ [英] Why does a % percentage appear at the end of the output to standard out but not when I use endl?

问题描述

为什么在此输出的末尾有％？我曾尝试刷新流（而不是endl），但是当我通过调用endl结束流时，它会清除％。

Why is there a trailing % at the end of this output? I've tried flushing the stream (not endl), however when I end the stream with a call to endl it gets rid of the %. Any help here would be much appreciated.

template<class T>
void print_collection(T * t){
        for(int i = 0; i < t->size()-1; ++i){
                cout << t->at(i) << ", ";
        }
        std::cout<< t->at(t->size() -1);
        std::cout<<flush;
}

int main(){
        int n_A = 5;
        int A[] = {2, 3, -2, 34, -29};

        vector<int> vec(A, A + n_A);
        sort(vec.begin(), vec.end());

        print_collection(&vec);
        return 0;
}

OUTPUT
-29, -2, 2, 3, 34%  

以下是有关编译器的更多信息，我使用的是macOS 10.15.4：

Here is more information about the compiler, I'm using macOS 10.15.4:

g++ -Wall -std=c++11 array.cpp -o array

g++ Information:
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 11.0.3 (clang-1103.0.32.59)
Target: x86_64-apple-darwin19.4.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin  

推荐答案

重复的问题。谢谢@WBuck！

Duplicate question. Thanks @WBuck!

@Kevin状态：
当程序的输出（非null）不包含尾随换行符时，zsh会添加颜色-倒置％以指示这一点，并在打印提示之前移至下一行；通常，它比bash的行为更方便，只需在输出结束处启动命令提示符即可。

@Kevin states: When (non-null) output from a program doesn't include a trailing newline, zsh adds that color-inverted % to indicate that and moves to the next line before printing the prompt; it's generally more convenient than bash's behavior, just starting the command prompt where the output ended.

获取一个奇怪的百分比符号在printf中输出。在终端中使用C来获取printf输出中的一个奇怪的百分比符号。

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