Good pointer example

Program code # include <stdio. h>

Main ()
{
Int A, B;/* defines two integer variables A and B */
Int * point_1, * point_2, * temp_point;/* defines three pointer variables */
Scanf ("% d, % d", & A, & B);/* format the value of A and B */
Point_1 = & A;/* point the value of the pointer variable point_1 to the address of variable */
Point_2 = & B;/* point the value of point_2 to the address of variable B */
If (A <B)
{
Temp_point = point_1;/* Here, temp_point is used to temporarily store the value of point_1, that is, the address of variable */
Point_1 = point_2;/* assign point_2 to point_1 */
Point_2 = temp_point;
/* The point_1 value cannot be found because it has been changed. Use the temporary storage method temp_point to retrieve the original point_1 value and assign it to point_2 to change the point_1 and point_2 values */
}
Printf ("% d, % d", * point_1, * point_2 ); /* use * point_1 and * point_2 to distinguish between B and A to display the value on the screen */
}

/* Note that this question is correct. This method does not change the variable A. The value of B only uses the pointer variable to store the addresses of A and B respectively, then swap the values of the two pointer variables, which are actually stored in
The address of A and B in the pointer variable is swapped, and * point_1 and * point_2 are used to display the exchanged value. * point_1 is actually, in this example, the algorithm does not actually change the values of A and B,
Use pointers for address switching to sort the size.
*/

Program code
# Include <stdio. h>

Main ()
{
Int A, B;/* defines two integer variables A and B */
Int * point_1, * point_2;/* defines three pointer variables */
Scanf ("% d, % d", & A, & B);/* format the value of A and B */
Point_1 = & A;/* point the value of the pointer variable point_1 to the address of variable */
Point_2 = & B;/* point the value of point_2 to the address of variable B */
Compositor (point_1, point_2);/* Call the number of custom sorting Han, and pass the addresses of A and B to point_1 and point_2 */
Printf ("% d, % d", a, B);/* print the values of A and B */
}

Static compositor (P1, P2)
Int * P1, * P2;/* defined format parameter P1. P2 is the pointer variable */
{
Int temp;/* create a temporary storage variable */
If (* P1 <* P2)/* If * P1 <P2, note that * P1 and * P2 are actually a and B */
{
Temp = * P1;/* use the variable temp for temporary storage * P1 and a value */
* P1 = * P2;/* replace * P1 value (that is, the value of a) with * P2 value (that is, the value of B), which is equivalent to a = B */
* P2 = temp;/* Equivalent the * P2 value, that is, the temp value, to B = temp */
}
}