使用向量 [英] Using Vectors
问题描述
大家好，
请我尝试逐行从文本文件中复制并将
文本以相反的顺序粘贴到另一个文本文件中也是逐行制作
第一行是最后一行，最后一行是第一行。
我尝试使用以下代码中的向量，但它刚赢了不要跑。
请帮助
----------------------- -------------------
#include< string>
#include< iostream> ;
#include< fstream>
#include< vector>
使用命名空间std;
int main（）{
vector< string> v;
ifstream in（" mtext1.txt"）;
ofstream out（" mtext2.txt"）;
string line;
while（getline（in，line））{
v.push_back（line）;
}
int j = v.size（）;
for（int i = 0; i< j; i ++）{
out<< v [j];
j = j-1;
}
}
Hi all,
Please I tried to copy from a text file line by line and to paste the
text in reverse order in another text file also line by line-Making the
first line the last and the last line the first.
I tried using vectors in the following codes but it just won''t run.
please help
------------------------------------------
#include <string>
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
int main() {
vector<string> v;
ifstream in("mtext1.txt");
ofstream out("mtext2.txt");
string line;
while (getline (in, line) ) {
v.push_back(line);
}
int j = v.size();
for(int i=0; i < j; i++) {
out << v[j] ;
j=j-1;
}
}
推荐答案
edward_nig写道：
edward_nig wrote:
大家好，
请我尝试逐行从文本文件中复制并粘贴
文本以相反的顺序在另一个文本文件中逐行 - 使第一行成为最后一行，最后一行是第一行。
我尝试使用以下代码中的向量但它只是不会跑。
请帮助
---------------------------- --------------
#include< string>
#include< iostream>
#include< fstream>
#include< vector>
使用命名空间std;
int main（）{
vector< string> v;
ifstream in（" mtext1.txt"）;
ofstream out（" mtext2.txt"）;
string line;
while（getline（in，line））{
v.push_back（line）;
}
int j = v.size（）;
int j = v.size（） - 1;
for（int i = 0; i< j; i ++）{
for语句毫无意义。
out<< v [j];
j = j-1;
}
}
Hi all,
Please I tried to copy from a text file line by line and to paste the
text in reverse order in another text file also line by line-Making the
first line the last and the last line the first.
I tried using vectors in the following codes but it just won''t run.
please help
------------------------------------------
#include <string>
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
int main() {
vector<string> v;
ifstream in("mtext1.txt");
ofstream out("mtext2.txt");
string line;
while (getline (in, line) ) {
v.push_back(line);
}
int j = v.size();
int j = v.size() - 1;
for(int i=0; i < j; i++) {
the for statement makes no sense.
out << v[j] ;
j=j-1;
}
}
试试......
for（int j = v.size（）; j--> 0;）{
并删除j = j-1;
for（int i = 0; i< j; i ++）{
try ...
for ( int j = v.size(); j-- > 0; ) {
and remove the j=j-1;
for(int i=0; i < j; i++) {
它仍然不会工作。它将文本逐行传输到第二个
文件，但它仍然没有反过来。
Hi,
It still won''t work. It transfers the texts line by line to the second
file, but it still wasn''t done in reverse other.
" edward_nig" < ED *********** @ gmail.com>在消息中写道
新闻：11 ********************** @ i39g2000cwa.googlegr oups.com ...
"edward_nig" <ed***********@gmail.com> wrote in message
news:11**********************@i39g2000cwa.googlegr oups.com...
大家好，
请我尝试逐行从文本文件中复制并将
文本以相反顺序粘贴到另一个文本文件中 - 也可以逐行
第一行是最后一行，最后一行是第一行。
我尝试使用以下代码中的向量，但它不会运行。
请帮助
Hi all,
Please I tried to copy from a text file line by line and to paste the
text in reverse order in another text file also line by line-Making the
first line the last and the last line the first.
I tried using vectors in the following codes but it just won''t run.
please help
[snip]
使用索引以相反的顺序遍历std :: vector可能会令人困惑。
但是没有需要这样做：
无效
反向（）
{
typedef std ::矢量<的std :: string> t_vec;
t_vec v;
std :: ifstream in（" mtext1.txt"）;
std :: ofstream out（" ; mtext2.txt"）;
std :: string line;
while（getline（in，line））
v.push_back（line）;
for（t_vec :: reverse_iterator i = v.rbegin（）; i！= v.rend（）; ++ i）
out<< * i<< ''\ n'';
}
[snip]
Traversing a std::vector in reverse order using indexes can be confusing.
However there is no need to do it that way:
void
reverse()
{
typedef std::vector<std::string> t_vec;
t_vec v;
std::ifstream in("mtext1.txt");
std::ofstream out("mtext2.txt");
std::string line;
while (getline(in, line))
v.push_back(line);
for (t_vec::reverse_iterator i = v.rbegin(); i != v.rend(); ++i)
out << *i << ''\n'';
}
这篇关于使用向量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IT屋！
