Question

Declare two int: x and y Declare two pointers p and q capable of pointing to int Make p point to y Make q point to x Assign 3 and 6 to x and y without mentioning x and y Redirect p to point to the same location q points to (two ways) Make q point to y Swap the values of x and y without mentioning x and y. Please write your code in C

Answer 1

The required statements are given below:

//Declare two int: x and y
int x, y;

//Declare two pointers p and q capable of pointing to int
int *p, *q;

//Make p point to y Make q point to x
p = &y;
q = &x;

//Assign 3 and 6 to x and y without mentioning x and y
*q = 3;
*p = 6;

//Redirect p to point to the same location q points to (two ways) Make q point to y
p = q;
q = &y;

//Swap the values of x and y without mentioning x and y
*p = *p + *q;
*q = *p - *q;
*p = *p - *q;

The complete program using the above statement for testing is given below:

#include <stdio.h>

int main()
{
//Declare two int: x and y
int x, y;
  
//Declare two pointers p and q capable of pointing to int
int *p, *q;
  
//Make p point to y Make q point to x
p = &y;
q = &x;
  
//Assign 3 and 6 to x and y without mentioning x and y
*q = 3;
*p = 6;
  
//Redirect p to point to the same location q points to (two ways) Make q point to y
p = q;
q = &y;
  
//Swap the values of x and y without mentioning x and y
*p = *p + *q;
*q = *p - *q;
*p = *p - *q;
  
//display the value of x and y
printf("x = %d \ny = %d", x, y);

return 0;
}

OUTPUT:

x = 6
y = 3