Embed Size (px)
Citation preview
Passing arguments by value
void func (int x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
a:
Passing arguments by value
void func (int x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10a:
Passing arguments by value
void func (int x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10a:
Passing arguments by value
void func (int x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10a:
10x:
Passing arguments by value
void func (int x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10a:
4x:
Passing arguments by value
void func (int x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10a:
Passing arguments by reference
void func (int *x) { *x = 4;}
...
int *a = new int(10);...func(a);cout << *a << “\n”;
a: 10
Passing arguments by reference
void func (int *x) { *x = 4;}
...
int *a = new int(10);...func(a);cout << *a << “\n”;
a: 10
Passing arguments by reference
void func (int *x) { *x = 4;}
...
int *a = new int(10);...func(a);cout << *a << “\n”;
a: 10
x:
Passing arguments by reference
void func (int *x) { *x = 4;}
...
int *a = new int(10);...func(a);cout << *a << “\n”;
a: 4
x:
Passing arguments by reference
void func (int *x) { *x = 4;}
...
int *a = new int(10);...func(a);cout << *a << “\n”;
a: 4
Passing arguments by name
void func (int &x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10a:
Passing arguments by name
void func (int &x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10a:
Passing arguments by name
void func (int &x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
10x:
Passing arguments by name
void func (int &x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
4x:
Passing arguments by name
void func (int &x) { x = 4;}
...
int a = 10;...func(a);cout << a << “\n”;
4x:
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
x.s:
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
a.s: bye
x.s:
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
a.s: bye
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
x.s:
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
x.s:
t = a
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
x.s:
t = a
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
x.s: hi
t = a
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
x.s: bye
Passing arguments by value
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); } A(A &t) { // copy constructor s = new char[strlen(t.s)]; strcpy(s,t.s); }};void func (A x) { x.s = “bye”; }...A a(“hi”);...func(a);cout << a << “\n”;
a.s: hi
Passing arguments by reference
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A *x) { x->s = “bye”;}...A *a = new A(“hi”);...func(a);cout << a << “\n”;
a: hi
a->s:
Passing arguments by reference
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A *x) { x->s = “bye”;}...A *a = new A(“hi”);...func(a);cout << a << “\n”;
a: hi
a->s:
Passing arguments by reference
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A *x) { x->s = “bye”;}...A *a = new A(“hi”);...func(a);cout << a << “\n”;
a: hi
a->s:
x:
Passing arguments by reference
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A *x) { x->s = “bye”;}...A *a = new A(“hi”);...func(a);cout << a << “\n”;
a: bye
a->s:
x:
Passing arguments by reference
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A *x) { x->s = “bye”;}...A *a = new A(“hi”);...func(a);cout << a << “\n”;
a: bye
a->s:
x:
Passing arguments by name
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A &x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
a: hi
a.s:
Passing arguments by name
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A &x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
a: hi
a.s:
Passing arguments by name
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A &x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
x: hi
a.s:
Passing arguments by name
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A &x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
x: bye
a.s:
Passing arguments by name
class A {public: char *s; A(char *t) { s = new char[strlen(t)]; strcpy(s,t); }}; void func (A &x) { x.s = “bye”;}...A a(“hi”);...func(a);cout << a << “\n”;
x: bye
a.s:
