複製和連線 strcpy() strcat()
#include <stdio.h>
#include <string.h>
int main(void)
{
/* Always ensure that your string is large enough to contain the characters
* and a terminating NUL character ('\0')!
*/
char mystring[10];
/* Copy "foo" into `mystring`, until a NUL character is encountered. */
strcpy(mystring, "foo");
printf("%s\n", mystring);
/* At this point, we used 4 chars of `mystring`, the 3 characters of "foo",
* and the NUL terminating byte.
*/
/* Append "bar" to `mystring`. */
strcat(mystring, "bar");
printf("%s\n", mystring);
/* We now use 7 characters of `mystring`: "foo" requires 3, "bar" requires 3
* and there is a terminating NUL character ('\0') at the end.
*/
/* Copy "bar" into `mystring`, overwriting the former contents. */
strcpy(mystring, "bar");
printf("%s\n", mystring);
return 0;
}
輸出:
foo
foobar
bar
如果你附加到現有字串或從現有字串複製,請確保它是 NUL 終止的!
字串文字(例如 foo
)將始終由編譯器終止 NUL。