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#2
rjsp2017-03-07 15:01
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void swapr(int &a, int &b);
void swapp(int *p, int *q);
void swapv(int a, int b);
int main()
{
int wallet1 = 300;
int wallet2 = 350;
cout << "wallet1 = $" << wallet1;
cout << " wallet2 = $" << wallet2 << endl;
cout << "using references to swap contents: " << endl;
swapr(wallet1, wallet2);
cout << "wallet1 = $" << wallet1;
cout << " wallet2 = $" << wallet2 << endl;
cout << "using pointers to swap contents again: " << endl;
swapp(&wallet1, &wallet2);
cout << "wallet1 = $" << wallet1;
cout << " wallet2 = $" << wallet2 << endl;
cout << "trying use passing by value:" << endl;
swapv(wallet1, wallet2);
cout << "wallet1 = $" << wallet1;
cout <<" wallet2 = $" << wallet2 << endl;
return 0;
}
void swapr(int &a, int &b)
{
int temp;
temp = a;
a = b;
b = temp;
}
void swapp(int *p, int *q)
{
int temp;
temp = *p;
*p = *q;
*q = temp;
}
void swapv(int a, int b)
{
int temp;
temp = a;
a = b;
b = temp;
}
void swapp(int *p, int *q);
void swapv(int a, int b);
int main()
{
int wallet1 = 300;
int wallet2 = 350;
cout << "wallet1 = $" << wallet1;
cout << " wallet2 = $" << wallet2 << endl;
cout << "using references to swap contents: " << endl;
swapr(wallet1, wallet2);
cout << "wallet1 = $" << wallet1;
cout << " wallet2 = $" << wallet2 << endl;
cout << "using pointers to swap contents again: " << endl;
swapp(&wallet1, &wallet2);
cout << "wallet1 = $" << wallet1;
cout << " wallet2 = $" << wallet2 << endl;
cout << "trying use passing by value:" << endl;
swapv(wallet1, wallet2);
cout << "wallet1 = $" << wallet1;
cout <<" wallet2 = $" << wallet2 << endl;
return 0;
}
void swapr(int &a, int &b)
{
int temp;
temp = a;
a = b;
b = temp;
}
void swapp(int *p, int *q)
{
int temp;
temp = *p;
*p = *q;
*q = temp;
}
void swapv(int a, int b)
{
int temp;
temp = a;
a = b;
b = temp;
}
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为什么利用指针交换两个数没有成功?请大神帮忙