Good pointer --- use the function that returns the pointer value (continued)

For example, the function that returns the pointer value can also be interpreted as passing the memory using the pointer.

In addition to dynamic memory, a pointer can also be returned to a static storage area. However, the swap memory cannot be passed using pointers. Because the swap memory function disappears at the end, some junk content will be returned, which is invalid.

For the basic content, see: Good At Pointers-use functions that return pointer values

// When returning a pointer, in addition to the dynamic memory, you can also return the static storage area # include <iostream> # include <string> using namespace STD; // use the pointer to pass the value char * testpointerforwardvalue (char * pchar2) {char * pchar = new char [strlen (pchar2) + 1]; // use strlen () the function calculates the number of characters in the string. 1if (null = pchar) {exit (0);} strcpy (pchar, pchar2); cout <pchar <Endl; return pchar;} // use the pointer reference to pass the value char * testreferencepointer (char * & rpchar) {char * pchar = new char [strlen (rpchar) + 1]; if (null = pchar) {exit (0) ;} Strcpy (pchar, rpchar); cout <pchar <Endl; return pchar;} // use the returned pointer to pass the value: Pass the dynamic memory, if the swap memory is passed, an error occurs: char * testreturndynamicmemory (char a []) {char B [100]; char * pconst = "Sichuan University! "; Char * pchar = new char [strlen (A) + strlen (pconst) + 1]; If (null = pchar) {exit (0);} strcpy (B, a); // The cout <B <Endl; strcpy (pchar, a); strcat (pchar, pconst); Return pchar; // if it is changed to return B, the callback memory is returned, and the output content is invalid.} // use the returned pointer to pass the value: pass the static storage space char * testrenturstaticmeory () {char * P = "Diaoyu Islands is Chinese inherent territory. "; cout <p <Endl; // return P of the string that outputs the static memory space; // string that allows passing the static memory space} int main () {char A1 [] = "Hello, sichua N University! "; Char * P1 = A1; char A2 [] =" Hello, College of computer! "; Char * P2 = a2; char * P = NULL; cout <" sizeof (A1): "<sizeof (A1) <", sizeof (P1 ): "<sizeof (P1) <", strlen (P1): "<strlen (P1) <Endl; P = testpointerforwardvalue (P1 ); cout <p <Endl; Delete [] P; // The caller releases new memory space P = testreferencepointer (P2); cout <p <Endl; delete [] P; // The caller releases the new memory space P = testreturndynamicmemory (A2); cout <p <Endl; Delete [] P; // The caller releases the new memory space P = testrenturstaticmeory (); cout <p <Endl; System ("pause"); Return 0 ;}

Good pointer --- use the function that returns the pointer value (continued)