void change(int *x，int * y){ int z； z = * x； * x = * y； * y = z； printf("%d，%d\n "，*x，* y)； }
Is to exchange the values of *x and *y variables, and then print the exchanged two values.
To exchange the values of two int variables A and B in a program, use change (&; I. & AMPB); Realize. The exchange result realized in the change function can also be reserved for variables A and B in the main tone function.