11.18 first pointer operation

This is a problem. The teacher asked us to write a simple exchange program and realized that three steps are different or two values can be exchanged. So I want to define a simple function outside the main function to implement the function call and then implement the function.

At the beginning, it was like this:

Swap (int A, int B)

{

A = a ^ B;

B = a ^ B;

A = a ^ B;

}

But after the call, I found that the values of A and B in the main function were not actually changed. It only used copies of the values in the main function. How can I solve this problem?

The solution is as follows:

I:

Main ()

{

Int A = 1, B = 2;

Swap (& A, & B );

}

Swap (int * a, int * B)

{

* A = * a ^ * B; // a simple example can be provided, for example, the difference between 0000 0001 and 0000 0010, or two values can be passed.

* B = * a ^ * B;

* A = * a ^ * B;

}

II:

It is also possible to use intermediate variables, but this is really old, we still need to strive for every day, and strive to write high-quality programs !!!