Stroustrup 5.9，练习1 [英] Stroustrup 5.9, exercise 1
问题描述
------ PROGRAM -----------
/ * Stroustrup，5.9，练习
写一些声明（带初始值）
评论解释我们打算做什么
* /
#include< iostream>
int main（）
{
//指向角色的指针
char c1 =''a'' ;
char * pc1 =& c1;
// 10个整数的数组
const int arr_size = 10;
char arr_int [arr_size];
//对10个整数数组的引用
char& r_arr_int = arr_int;
//指向字符串数组的指针
/ * SORRY但我不知道如何呈现数组
字符串* /
//指向char的指针
char c;
char * pc =& c;
char * ppc = pc;
//一个常数整数
const int ci = 7;
//指向常数整数的指针
const int * pci =& ci;
//一个指向整数的常量指针
int j = 8;
int * const cpi =& j;
return 0;
}
--------- OUTPUT ---------------
[arch @ voodo tc ++ pl] $ g ++ 5.9_ex-01.cpp
5.9_ex-01.cpp：在函数''int main（）''：
5.9_ex-01.cpp：23：错误：非const引用无效初始化
类型为''char&''来自临时类型''char * ''
[arch @ voodo tc ++ pl] $
----------- ------------------------
我没有使用-ansi -W标志，因为他们发出警告我做了
此刻不需要纠正。我知道这是一个错误：
//对10个整数数组的引用
char& r_arr_int = arr_int;
我找不到任何方法来创建对整数的引用。顺便说一句，所有
声明都可以吗？
g ++ 5.9_ex-01.cpp
5.9_ex-01.cpp：在函数''int main（）''中：
5.9_ex-01.cpp：23：错误：非const引用的初始化无效
类型''char&''来自临时类型''char *''
[arch @ voodo tc ++ pl]
-----------------------------------
i没有使用-ansi -W标志，因为他们发出警告我做了
此刻不需要纠正。我知道这是一个错误：
//对10个整数数组的引用
char& r_arr_int = arr_int;
我找不到任何方法来创建对整数的引用。顺便说一下，所有
声明都好吗？
* arnuld：
>
i知道这是一个错误：
//对10个整数数组的引用
焦炭和放大器; r_arr_int = arr_int;
我找不到任何方法来创建对整数的引用。顺便说一下，所有
声明都好吗？
上面你有一个对char的引用，用一个
整数数组初始化。
一边是苹果，另一边是橘子。
这是对数组的引用：
int（& r_arr_int）[10] = arr_int;
-
答：因为它弄乱了人们通常阅读文本的顺序。
Q ：为什么这么糟糕？
A：热门帖子。
问：usenet和电子邮件中最烦人的是什么？
------ PROGRAMME -----------
/* Stroustrup, 5.9, exercises
to write some declarations (with initializers)
comments explain what we intend to do
*/
#include<iostream>
int main()
{
// a pointer to a character
char c1 = ''a'';
char* pc1 = &c1;
// an array of 10 integers
const int arr_size = 10;
char arr_int[arr_size];
// a reference to an array of 10 integers
char& r_arr_int = arr_int;
// a pointer to an array of character strings
/* SORRY but i do not know how to present an array
of character strings */
// a pointer to a pointer to a char
char c;
char* pc = &c;
char* ppc = pc;
// a constant integer
const int ci = 7;
// a pointer to a constant integer
const int* pci = &ci;
// a constant pointer to an integer
int j = 8;
int *const cpi = &j;
return 0;
}
--------- OUTPUT ---------------
[arch@voodo tc++pl]$ g++ 5.9_ex-01.cpp
5.9_ex-01.cpp: In function ''int main()'':
5.9_ex-01.cpp:23: error: invalid initialization of non-const reference
of type ''char&'' from a temporary of type ''char*''
[arch@voodo tc++pl]$
-----------------------------------
i did not use "-ansi -W" flags as they were emitting warnings i did
not need to correct at this moment. i know that this is an error:
// a reference to an array of 10 integers
char& r_arr_int = arr_int;
i dont find any way to create a reference to an integer. BTW, are all
declarations fine ?
g++ 5.9_ex-01.cpp
5.9_ex-01.cpp: In function ''int main()'':
5.9_ex-01.cpp:23: error: invalid initialization of non-const reference
of type ''char&'' from a temporary of type ''char*''
[arch@voodo tc++pl]
-----------------------------------
i did not use "-ansi -W" flags as they were emitting warnings i did
not need to correct at this moment. i know that this is an error:
// a reference to an array of 10 integers
char& r_arr_int = arr_int;
i dont find any way to create a reference to an integer. BTW, are all
declarations fine ?
* arnuld:>
i know that this is an error:
// a reference to an array of 10 integers
char& r_arr_int = arr_int;
i dont find any way to create a reference to an integer. BTW, are all
declarations fine ?What you have above is a reference to char, initialized with an array of
integers.
Apples on one side, oranges on the other side.
This is a reference to an array:
int (&r_arr_int)[10] = arr_int;
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
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