,
,
.
1) strcpy()
2) strncpy()
strcpy(to, from)- from to.
to from.
"" ( ,
)
, to from, strcpy strncpy:
strcpy(to,from) ,
y (from), 0, , (to).
strncpy(to,from,n) , n , , . - , , n to -. ( n from) - to .
. , - -, , .
3) strcat()
strcat(s1, s2)- s2 s1.
s2 .
4) strcmp()
strcmp (s1, s2)- s1 s2(-)
s1 =s2 0
s1 >s2
s1 <s2
5) strclen()
strclen(s) ,
, - - ( m 100), , -.
____________________________________________
- .
**************************************************
// Never trouble trouble, till trouble troubles you
// , //
//arb2009_stroka6_1
#include<iostream.h>
#include<string.h>
void main()
{
int m;
char a[100] = "Never trouble trouble";
cout<<"Enter length of string m= ";
cin>>m;
char *p = new char[m];
strcpy(p,a);
cout<<"String p= "<<p<<endl;
char b[100] = "Good day!";
strncpy(p,b,strlen(b)+1);
cout<<"String b= "<<b<<endl;
}
****************************************************
m=20,
"Never trouble trouble"
"Good day!"
|
|
|
m=3,
"Never trouble trouble"
"Good day!"
" "
p 3
*************************************************
// Never trouble trouble, till trouble troubles you
// , //
//arb2014_basic_functions
#include<iostream.h>
#include<string.h>
void main()
{
int m;
char a[100] = "Never trouble trouble";
cout<<"Enter length of string m= ";
cin>>m;
char *p= new char[m];
strcpy(p,a);
cout<<"length p="<<strlen(p)<<endl;
cout<<"String p= "<<p<<endl;
char b[100] = "Good day!";
strncpy(p,b,strlen(b)+1));
cout<<"String p= "<<p<<endl;
}
.
m=30 m=3
strcpy(p,a);
cout<<"length p="<<strlen(p)<<endl;
// 30 (?)
//arb2009_stroka5_1
#include<iostream.h>
#include<string.h>
void main()
{
char a[100] = "Never trouble trouble";
int m;
cout<<"Enter length of string m= ";
cin>>m;
char *p = new char[m];
char *q = new char [m];
strcpy(p,a);
cout<<"String p= "<<p<<endl;
char b[100] = "Good day!";
strncpy(p,b,3);
cout<<"String p= "<<p<<endl;
strncpy(q,b,3);
cout<<"String q= "<<q<<endl;
}
**********************************************
m=3
:
strcpy(p,a);
cout<<"String p= "<<p<<endl;
:
String p= Never trouble trouble;
:
char b[100] = "Good day!";
strncpy(p,b,3);
cout<<"String p= "<<p<<endl
:
String p= Gooer trouble trouble;
strncpy(q,b,strlen(b)+1);
cout<<"String q= "<<q<<endl;
String p= "Good day!";
m=10
,
p ,
"Never trouble trouble".
"Good day!", 3
3 -, -, .
Gooer trouble trouble
p |.|------->| Never trouble trouble\0 |
Nev Goo
p |.|------->| Gooer trouble trouble\0 |
**************************************************
atoi(str). , , .
, .
0.
(long) (double) atol atof .
|
|
|
//arb2009_stroka7_1
#include<iostream>
#include<cstring>
#include<cstdlib>
using namespace std;
void main()
{
char a[]= "10) Height-162sm, weight-59.55 kg";
int num;
long height;
double weight;
num = atoi(a);
height = atol(&a[11]);
weight = atof(&a[25]);
cout<<num<<' '<<height<<' '<<weight<<endl;
}
10 162 59.55
1
//arb2014_demostr_functions_Cstring
#include <iostream.h>
#include <string>
#include <ctype.h>
using namespace std;
void main()
{
char s1[30], s2[30];
strcpy(s1,"C++");
strcpy(s2," is power language!");
cout<<"Length of string s1="<<strlen(s1)<<endl;
cout<<"Length of string s2="<<strlen(s2)<<endl;
if (!strcmp(s1,s2)) cout<<"This strings are equals"<<endl;
else cout<<"This strings are not equals"<<endl;
strcat(s1,s2);
cout<<"s1= strcat(s1,s2); s1= "<<s1<<endl;
strcpy(s2,s1);
cout<<"s2=strcpy(s2,s1) s2="<<s2<<endl;
if (!strcmp(s1,s2)) cout<<"This strings are equals"<<endl;
else cout<<"This strings are not equals"<<endl;
cout<<"enter s1=";
cin>>s1;
s1[0]='A';
cout<<"s1[0]='A' s1= "<<s1<<endl;
int i;
for (i=0;s1[i];i++)
s1[i]= toupper(s1[i]);
cout<<"Upper s1="<<s1<<endl;
for (i=0;s1[i];i++)
s1[i]= tolower(s1[i]);
cout<<"Lower s1="<<s1<<endl;
}
2
