bool细节

B）整数5 C）实施定义？ 以下陈述是否始终相同： k = true; ++ k; k = false; --k; 即使k最初被设置为5？ -JKop Will the following print "NOT equal" on all implementations: #include <iostream> signed main(){bool k; k = 5; std::cout << (k == 5 ? "equal" : "NOT equal");}Let''s say that a bool is 8-Bit on a particular implementation. When youassign 5 to a bool, does the bool''s bit pattern represent: A) The integer 1 B) The integer 5 C) Implementation-defined ?Are the following statments equivalent at all times: k = true;++k; k = false;--k;Even if k had initially been set to 5?-JKop推荐答案 请问以下打印 不等于 true true 在所有实施中？ #include< iostream> 签名main（） { bool k; k = 5; std :: cout<< （k == 5？相等：不等于）<< ''\ n''; k - = 2; std :: cout<< （k？" true"：" false"）<< ''\ n''; k - = 3; std :: cout<< （k？" true"：" false"）; } k - = 2的影响是什么？ - JKop Will the following print NOT equaltruetrue on all implementations?#include <iostream> signed main(){bool k; k = 5; std::cout << (k == 5 ? "equal" : "NOT equal") << ''\n''; k -= 2; std::cout << ( k ? "true" : "false") << ''\n''; k -= 3; std::cout << ( k ? "true" : "false");}What is the effect of k -=2 ?-JKop JKop写道： JKop wrote: 以下打印不等于在所有实施中： #include< iostream> 签署main（） { bool k; k = 5; std :: cout<< （k == 5？等于：不等于）; } 假设bool在特定实现上是8位。当你为布尔分配5时，布尔的位模式是否代表： A）整数1 也许。 B）整数5 也许。 C）实现定义？ 是。 以下陈述是否始终相同： k = true; ++ k ; k = false; - k; 它们永远不等同。第一个将k设置为false，第二个将设置为true。 即使k最初设置为5？ Will the following print "NOT equal" on all implementations: #include <iostream> signed main() { bool k; k = 5; std::cout << (k == 5 ? "equal" : "NOT equal"); } Let''s say that a bool is 8-Bit on a particular implementation. When you assign 5 to a bool, does the bool''s bit pattern represent: A) The integer 1Maybe. B) The integer 5Maybe. C) Implementation-defined ?Yes. Are the following statments equivalent at all times: k = true; ++k; k = false; --k;They are never equivalent. The first one sets k to false, the second onesets it to true. Even if k had initially been set to 5? bool只知道两个值，true和false。如果为它分配一个整数 ，那么该整数首先被转换为bool（0导致 为真，其他任何值为false），然后k被设置这个价值。 A bool only knows two values, true and false. If you assign an integerto it, that integer gets converted to bool first (with 0 resulting intrue, any other value in false), and then k gets set to that value. " JKop" < NU ** @ NULL.NULL>在留言新闻中写道：Ps ****************** @ news.indigo.ie ... "JKop" <NU**@NULL.NULL> wrote in message news:Ps******************@news.indigo.ie... bool k; k = 5; 这将k设置为true std :: cout<< （k == 5？等于：不等于）; 这里将k的值提升为int。如果k之前是真的那么它的值将是1 。 让我们说一个bool在特定实现上是8位。当你为bool分配5时，bool的位模式是否代表：\ bool k; k = 5;This sets k to "true" std::cout << (k == 5 ? "equal" : "NOT equal");The value of k is promoted to int here. It''s value will be 1if k had been true before. Let''s say that a bool is 8-Bit on a particular implementation. When you assign 5 to a bool, does the bool''s bit pattern represent:\ 它代表一个真实的值。这取决于实现如何对它进行编码。 。然而。所有具有真值的bool都比较相等。 所有bool true值在转换为整数时转换为1. 所以，尽管它完全可以接受实现在bool中存储一个表示 的5，你很难分辨，因为 static_cast< int>（k） 将始终为1. It represents a value that would be true. It''s up to the implementation to figureout how to encode it. However. All bools with true values compare equal.All bool true values convert to 1 when converted to an integer. So, while it is perfectly acceptable for the implementation to store a representationof 5 in the bool, it will be hard for you to tell, asstatic_cast<int>(k)will always be 1. 这篇关于bool细节的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！