題目：有3個線程A，B， C， 請用多線程編程實現在屏幕上循環打印10次ABCABC...， 其中A線程打印“A”， B線程打印“B”， C線程打印“C”。
使用C++11 實做， 代碼如下：
#include <iostream>#include <thread>#include <condition_variable>#include <vector>#include <algorithm>std::mutex mtx;std::condition_variable cvar;char g_ch = 0;void PRint_fun(char ch){ int cyle_cnt = 10; char ch_ = ch - 'A'; for (int i = 0; i < cyle_cnt; i++) { std::unique_lock<std::mutex>ulk(mtx); cvar.wait(ulk, [ch_] {return ch_ == g_ch; }); std::cout << (char)(ch_ + 'A'); g_ch = (ch_ + 1) % 3; ulk.unlock(); cvar.notify_all(); }}int main(){ std::vector<std::thread> threads; threads.push_back(std::thread(print_fun, 'A')); threads.push_back(std::thread(print_fun, 'B')); threads.push_back(std::thread(print_fun, 'C')); std::for_each(threads.begin(), threads.end(), std::mem_fn(&std::thread::join)); std::cout << std::endl; system("pause"); return 0;}
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