C 標準模板庫STL

2020-2-2 寒假期間

typedef basic_string string;

string s1

("hello");
string s2=
"hello"
;string s3(8
,'x');
//8個x

string s=

"hello"
;int len=s.
length()
;int len2=s.
size()
;

string s,s1;

cin>>s;
getline
(cin,s1)
;

string s1=

"hello"
,s2,s3,s4;
s2=s1;
s3.assign
(s1)
;s4.
assign
(s1,1,
3);//從下標為1的字元開始 複製3個字元賦值s4

string s=

"hello"
;for
(int i=
0;isize()
;i++
)

string s1=

"hello"
;string s2=
"world"
;string s=s1+s2;
cout
s3=s1.
(s2)
;//把s2連線在s1後
s3=s1.
(s2,3,
5);//把s2中3到5的字元複製到s1後邊  沒有足夠字元的話到最後一位

compare 比較 s1.compare(s2),s1大返回1，s1小返回-1 ，相等返回0， s1.compare（1，2，s2，0，3），s1的1-2位與s2的0-3位比較；substr 擷取子串函式

string s1=

"hello world"
;string s2;
s2=s1.
substr(4
,5);
//擷取s1的4-5位賦值給s2
cout<"hello"
;string s2=
"world"
;s1.
swap
(s2)
;//交換s1  s2的值
coutstring s1=

"hello"
; cout
("l"
)
cout
("l"
)
string s=
"hello worlld"
; cout
("ll",1
)
cout
("ll",2
)
cout
("ll",3
)
/*輸出
2  3
2 29*/

string s1=

"hello world"
; cout
("abcdo"
)
cout
("abcdo"
)
("abcd"
)
cout
("abcd"
)<"hello"
; cout
)
cout
<"hello world"
;string s2;
s1.replace(2
,3,"hi");
//s1從2-3的字元替換為hi
cout
replace(2
,3,"123",1
,2);
//從s1的2-3個字元替換為「123」的1-2個字元
/* hehi world
he23 world
*

string s1=

"hello"
; string s3=s1;
string s2=
"world"
; s1.
insert(2
,s2)
;//從s1的第2個位置插入s2 
cout
,s2,2,
3)
/* heworldllo
herldllo
*/

string s1=

"hello"
;printf
("%s\n"
,s1.
c_str()
);//輸出
hello

string s1=

"hello world"
;int len=s1.
length()
;char
*p =
newchar
[len+1]
; s1.
copy
(p,2,0
);//從s1 下標位置0開始的長度為2的字串賦值給p 
cout

輸入流

string s=
"hello world 520 13.14 c"
; istringstream ss
(s);
string s1,s2;
int a;
double b;
char c;
ss>>s1>>s2>>a>>b>>c;
cout
hello
world
52013.14 c 
*/

輸出流

ostringstream s;
int a=
520;
s<<
"hello "
<" world"

)
*/