使用STL算法将布尔数组元素设置为false？ [英] Set boolean array elements to false using STL algorithm?
问题描述
我用什么STL算法将数组的所有bool元素设置为false，只需要一行代码？谢谢！
What STL algorithm do I use to set all bool elements of an array to false in
just one line of code? Thanks!
推荐答案
" Jason Heyes" < JA ******** @ optusnet.com.au>在消息中写道
news：43 *********************** @ news.optusnet.com.a u ...
|我用什么STL算法将数组的所有bool元素设置为
false
|只需一行代码？谢谢！
|
|
是什么让你相信你需要算法来做到这一点？
#include< iostream>
#include< ostream>
#include< vector>
int main（）
{
const sz（10）;
bool ba [sz] = {false};
std :: cout<< bool array with size =" << sz<< " \ n";
for（int i = 0; i< sz; ++ i）
{
std： ：cout<< " BA [" << i<< "] =" << ba [i];
std :: cout<< std :: endl;
}
std :: vector< bool> vb（10，false）;
std :: cout<< bool vector with size =" << sz<< " \ n";
for（int j = 0; j< sz; ++ j）
{
std： ：cout<< " BA [" << j<< "] =" << ba [j];
std :: cout<< std :: endl;
}
返回0;
}
/ *
bool数组大小= 10
ba [0] = 0
ba [1] = 0
ba [2] = 0
ba [3] = 0
ba [4] = 0
ba [5] = 0
ba [6] = 0
ba [7] = 0
ba [8] = 0
ba [9] = 0
布尔矢量，大小= 10
ba [0] = 0
ba [1] = 0
ba [2] = 0
ba [3] = 0
ba [4] = 0
ba [ 5] = 0
ba [6] = 0
ba [7] = 0
ba [8] = 0
ba [9] = 0
* /
"Jason Heyes" <ja********@optusnet.com.au> wrote in message
news:43***********************@news.optusnet.com.a u...
| What STL algorithm do I use to set all bool elements of an array to
false in
| just one line of code? Thanks!
|
|
What makes you believe that you need an algorithm to do that?
#include <iostream>
#include <ostream>
#include <vector>
int main()
{
const sz(10);
bool ba[sz] = {false};
std::cout << "bool array with size = " << sz << "\n";
for(int i = 0; i < sz; ++i)
{
std::cout << "ba[" << i << "] = " << ba[i];
std::cout << std::endl;
}
std::vector<bool> vb(10, false);
std::cout << "bool vector with size = " << sz << "\n";
for(int j = 0; j < sz; ++j)
{
std::cout << "ba[" << j << "] = " << ba[j];
std::cout << std::endl;
}
return 0;
}
/*
bool array with size = 10
ba[0] = 0
ba[1] = 0
ba[2] = 0
ba[3] = 0
ba[4] = 0
ba[5] = 0
ba[6] = 0
ba[7] = 0
ba[8] = 0
ba[9] = 0
bool vector with size = 10
ba[0] = 0
ba[1] = 0
ba[2] = 0
ba[3] = 0
ba[4] = 0
ba[5] = 0
ba[6] = 0
ba[7] = 0
ba[8] = 0
ba[9] = 0
*/
>
是什么让你相信你需要一个算法吗？
What makes you believe that you need an algorithm to do that?
这就是原因。
class Array {
bool arr [10];
public：
Array（）{/ * initialise arr * /}
};
如果我想在a中初始化arr，我应该用什么来代替注释
单行代码？
Here is why.
class Array {
bool arr[10];
public:
Array() { /* initialise arr */ }
};
What do I put in place of the comment if I want to initialise arr in just a
single line of code?
Jason Heyes写道：
Jason Heyes wrote:
What makes you believe that you need an algorithm to do that?
这就是原因。
类数组{
bool arr [10 ];
公开：
数组（）{/ *初始化arr * /}
};
如果我愿意，我该如何代替评论只用一行代码初始化arr？
Here is why.
class Array {
bool arr[10];
public:
Array() { /* initialise arr */ }
};
What do I put in place of the comment if I want to initialise arr in just a
single line of code?
#include< algorithm>
class Array
{
bool arr [10];
public：
Array（）
{
std :: fill_n（arr，sizeof（arr）/ sizeof（arr [0]），0）;
}
};
Greg
#include <algorithm>
class Array
{
bool arr[10];
public:
Array()
{
std::fill_n( arr, sizeof(arr)/sizeof(arr[0]), 0);
}
};
Greg
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