в 14:21, 25 мая 2010

2010-05-25T14:21:19Z

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2010-05-25T10:32:05Z

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==A string is an array of characters.==

<source lang="cpp">#include <stdio.h>
int main(){
char myname[] = "Dan";

printf("%s \n",myname);
}</source>
<pre class=codeResult>Dan</pre>

==String constants consist of text enclosed in double quotes==

We must use the standard library function strcpy to copy the string constant into the variable.
To initialize the variable name to Sam.

<source lang="cpp">#include <string.h>
int main()
{
char name[4];
strcpy(name, "Sam");
return (0);
}</source>

==Strings==

<OL><LI>A string is nothing more than a character array.</LI><LI>All strings end with the NULL character.</LI><LI>Use the %s placeholder in the printf() function to display string values.</LI></OL>

<source lang="cpp">#include <stdio.h>
main ( )
{
char *s1 = "abcd";
char s2[] = "efgh";
printf( "%s %16lu \n", s1, s1);
printf( "%s %16lu \n", s2, s2);
s1 = s2;
printf( "%s %16lu \n", s1, s1);
printf( "%s %16lu \n", s2, s2);
}</source>
<pre class=codeResult>abcd 4206592
efgh 2293584
efgh 2293584
efgh 2293584</pre>

==Strings always end with the NULL character==

ASCII code for the NULL character is \0

<source lang="cpp">#include <stdio.h>
int main(){
char myname[4];
myname[0] = "D";
myname[1] = "a";
myname[2] = "n";
myname[3] = "\0";
printf("%s \n",myname);
}</source>
<pre class=codeResult>Dan</pre>

==Useful string function==

Function
Description
strcpy(string1, string2)
Copy string2 into string1
strcat(string1, string2)
Concatenate string2 onto the end of string1
length = strlen(string)
Get the length of a string
strcmp(string1, string2)
0 if string1 equals string2, otherwise nonzero

==Write string in a more traditional array style==

<source lang="cpp">#include <stdio.h>
int main(){
char myname[] = { "D", "a", "n" };
printf("%s \n",myname);
}</source>
<pre class=codeResult>Dan?</pre>

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в 14:21, 25 мая 2010

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