求getline()函数具体用法，给个例子！

[Mingci_why]

getline()这个函数有什么功能啊，能否给个例子，越详细越好 谢谢！

[mstlq]

basic_istream::getline
Gets a line from the input stream.

basic_istream& getline(
   char_type *_Str, 
   streamsize _Count
);
basic_istream& getline(
   char_type *_Str, 
   streamsize _Count, 
   char_type _Delim
);

Parameters
_Count
The number of characters to read from strbuf.
_Delim
The character that should terminate the read if it is encountered before _Count.
_Str
A string in which to write.
Return Value
The stream (*this).
Remarks
The first of these unformatted input functions returns getline(_Str, _Count, widen('\n')).
The second function extracts up to _Count - 1 elements and stores them in the array beginning at _Str. It always stores char_type after any extracted elements it stores. In order of testing, extraction stops:
At end of file.
After the function extracts an element that compares equal to _Delim, in which case the element is neither put back nor appended to the controlled sequence.
After the function extracts _Count - 1 elements.
If the function extracts no elements or _Count - 1 elements, it calls setstate(failbit). In any case, it returns *this.
Example

// basic_istream_getline.cpp
// compile with: /EHsc
#include <iostream>
using namespace std;

int main( ) 
{
   char c[10];

   cin.getline( &c[0], 5, '2' );
   cout << c << endl;
}
Input
12
Output
1

[mstlq]

Example

// string_getline_sample.cpp
// compile with: /EHsc
// Illustrates how to use the getline function to read a
// line of text from the keyboard.
//
// Functions:
//
//    getline       Returns a string from the input stream.
//////////////////////////////////////////////////////////////////////

#pragma warning(disable:4786)
#include <string>
#include <iostream>

using namespace std ;

int main()
{
   string s1;
   cout << "Enter a sentence (use <space> as the delimiter): ";
   getline(cin,s1, ' ');
   cout << "You entered: " << s1 << endl;;
}

Input
test this

Sample Output
Enter a sentence (use <space> as the delimiter): test this
You entered: test

[starcat]

这个貌似不是标准的库函数
而是C圣经上的例题

[starcat]

读取一行到s数组中，返回该行的长度

#include <stdio.h>
#define MAXLINE 1000 /* maximum input line length */

int getline(char line[], int maxline);
void copy(char to[], char from[]);

/* print the longest input line */
main()
{
int len; /* current line length */
int max; /* maximum length seen so far */
char line[MAXLINE]; /* current input line */
char longest[MAXLINE]; /* longest line saved here */

max = 0;
while ((len = getline(line, MAXLINE)) > 0)
if (len > max) {
max = len;
copy(longest, line);
}
if (max > 0) /* there was a line */
printf("%s", longest);
return 0;
}

/* getline: read a line into s, return length */
int getline(char s[],int lim)
{
int c, i;

for (i=0; i < lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)
s[i] = c;
if (c == '\n') {
s[i] = c;
++i;
}
s[i] = '\0';
return i;
}

/* copy: copy 'from' into 'to'; assume to is big enough */
void copy(char to[], char from[])
{
int i;

i = 0;
while ((to[i] = from[i]) != '\0')
++i;
}

[Mingci_why]

0.0 例子怎么那么的长

[lly212]

getline:

cin.getline(地址,大小,结束符); 针对c格式字符串 由于不直接读取一串字符有越界危险

getline(对象,对象名,结束符); 主要面对string

知道上面就简单了
string name;
getline(cin,name); //读取name 默认是'\n'结束

char name[20];
cin.getline(name,19);
name[19] = '\0';

[wanjingwei]

[Quote=引用 6 楼 lly212 的回复:]
getline:

cin.getline(地址,大小,结束符); 针对c格式字符串 由于不直接读取一串字符有越界危险

getline(对象,对象名,结束符);  主要面对string

知道上面就简单了
string name;
getline(cin,name); //读取name 默认是'\n'结束

char name[20];
cin.getline(name,19);
name[19] = '\0';
[/Quote]
UP

[猫已经找不回了]

http://www.diybl.com/course/3_program/c++/cppjs/20090403/164143.html
这时一篇对比的文章，可以看看。

[ljx87085210]

csdn上大家答问题真踊跃啊。

[Mingci_why]

[Quote=引用 9 楼 ljx87085210 的回复:]
csdn上大家答问题真踊跃啊。
[/Quote]
嘿嘿是啊，这就是我喜欢来CSDN的原因。