:
, , :
- ;
- C++ ;
- -, 0, : \0;
- , , , :
char *mes[] ={" 1"," 2",...,","};
- , scanf , gets , <Enter> ' \ n '.
, -. - , 0, \0. - .
char str[10] = "Vasia";
// 10 9
// - 'V. '', 's'. '1. ''. '\0'
10 , 5 , -. , ( ):
char str [ ] = "Vasia"; // 6
char *str = "Vasia" , , ( , str[l]='o' ). , .
( ) (<string.h>). , , , , . ., .
. .
#include "stdafx.h"
#include "iostream"
#include "string.h"
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
char s[80], passw[] = "kuku"; // passw - .
// *passw = "kuku";
int i, k = 0;
for (i = 0;!k && i<3; i++)
{
cout<<"\nEnter password:\n";
gets(s); //
if (strstr(s,passw))
k = 1; //
}
if (k) cout<<"\nOk\n";
else cout<<"\nError!\n";
return 0;
}
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string.h. , , , , , ( ) .
1. int strlen (const char* s); - s. , . , - . ,
cout << strlen("Hello!"); // 6
char *str = "one";
cout << strlen(str); // 3
2. char *strcpy(char *s1, const char *s2); - s2 s1. s1. s1 , , . ,
char str[25]; // 25
char *ps = new char [25]; /*
25 */
strcpy(str, "ABCDE"); // str "ABCDE"
cout << str; // str . ABCDE
strcpy(ps, "QWERTY"); // ps "QWERTY"
cout << ps; // ps . QWERTY
delete[] ps; //
, , , , ! , , ps = "QWERTY" . , , "QWERTY", ( Q) ps. , ps, ps.
3. int *strcmp(const char *s1, const char *s2); - s1 s2 ( ASCII-). 0, s1 s2 , , s1 s2, , s1 s2. , , , ASCII- (.. "g" "ff"). ,
cout << strcmp("compare", "string"); /* -1,
"compare" "string" */
cout << strcmp("abcde", "abc"); /* 1,
"abcde" "abc" */
cout << strcmp("one", "one"); /* 0,
*/
4. char *strcat(char *s1, const char *s2); - s2 s1. s2 - s1. s1. s1 (strlen(s1)+strlen(s2)+1). ,
char st1[25] = "";
cout << strcat(st1, " !"); // !
5. char *strncpy(char *s1, const char *s2, int n); - n s2 s1. s1.
6. char *strncmp(char *s1, const char *s2, int n); - n s1 s2. 0, , 0 , 0, s1 , s2.
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7. char *strncat(char *s1, const char *s2, int n); - n s2 s1. s1.
8. char *strchr(const char *s, int c); - s c. c s. , NULL. ,
char str[20] = "ABCDEXYZ";
cout << strchr(str, 'X'); // XYZ
char str[20] = "ABCDEXYZ";
if (strchr(str, 'q') == NULL) cout << " !";
9. char *strstr(const char *s1, const char *s2); - s1 s2. s2 s1. , NULL. ,
char str[20] = "ABCDEXYZ";
char *ps = strstr(str, "DEX");
if (ps!= NULL)
cout << ps;
else
cout << " !";
// DEXYZ
10. char *strlwr(char *s); - (.. ). ,
char str[30] = "ABCDE_123_ijk_XYZ";
cout << strlwr(str);
// abcde_123_ijk_xyz
11. char *strupr(char *s); - (.. ).
12. char *strset(char *s, int ch); - s ch. ,
char str[30] = "ABCDE";
cout << strset(str, 'x'); // xxxxx
13. char *strnset(char *s, int ch, int n); - n s ch.
14. char *strrev(char *s); - ( , ..). ,
char str[30] = "12345";
cout << strrev(str); // 54321
5.2
1. , , . getch().
2. , .
3. , "" : , .
4. , . , , . (, , ).
<Enter>.
.
-> 1
: 1 : 49
-> 2
48
: 2 : 50
->
: : 235
- >.
5. , ( 0 127). . 0 15, 16 31 . .
6. , (, upcase ). (, , ).
<Enter>
-> C++,
Windows
, :
C++, WINDOWS
7. , , . (, , ).
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<Enter>
-> 23.5
.
8. , , .
9. , , .
10. , , .
11. , . (
).
<Enter>
-> 11101010
11101010 234
<Enter>__.
