Question

Hi, this program is in C.

Can you a pass by pointer in this program. Thanks.

#include
//function declaration/prototype here

int main(int argc, char * argv[]) {
int num1, num2;
  
printf("Please enter two integers (separated by ,):\n");
scanf("%d,%d", &num1, &num2); //enter two integers separated by a comma (,)
  
printf("num1 stores: %d\n", num1);
printf("num2 stores: %d\n", num2);
  
/*make a function call to make sure the followings are true after we call the function
(1) variable num1 stores the larger value after the function is called
(2) variable num2 stores the smaller value after the function is called
*/
  
  
printf("\nAfter calling the function\n");
printf("num1 stores the bigger one: %d\n", num1);
printf("num2 stores the smaller one: %d\n", num2);
  
return 0;
}

//function definition here

Answer 1

Here is a code done in C language for the above problem. It uses pass by pointers so as to see the changes reflected in both the functions.

CODE:

#include<stdio.h>
//function declaration/prototype here
void big_small_change(int *x, int *y);

int main(int argc, char * argv[]) {
   int num1, num2;

   printf("Please enter two integers (separated by ,):\n");
   scanf("%d,%d", &num1, &num2); //enter two integers separated by a comma (,)

   printf("num1 stores: %d\n", num1);
   printf("num2 stores: %d\n", num2);

   /*make a function call to make sure the followings are true after we call the function
   (1) variable num1 stores the larger value after the function is called
   (2) variable num2 stores the smaller value after the function is called
   */
   big_small_change(&num1,&num2);// calling the function by passing the address of the variables num1 and num2

   printf("\nAfter calling the function\n");
   printf("num1 stores the bigger one: %d\n", num1);
   printf("num2 stores the smaller one: %d\n", num2);

   return 0;
}

//function definition here
void big_small_change(int *x, int *y) {
   // here x points to num1 and y points to num2
   int smaller;// the variable that holds the smaller value
   if(!(*x > *y)) {// if the value of x is smaller than that of y
       smaller = *x;// hold the value of x into variable smaller
       *x = *y;// change the value of x by that in y
       *y = smaller;// giving y the smaller value
   }
  
}

OUTPUT:

Please enter two integers (separated by ,): 34,76 num1 stores: 34 num2 stores: 76 After calling the function num1 stores the bigger one: 76 num2 stores the smaller one: 34

Please enter two integers (separated by ,): 12,9 num1 stores: 12 num2 stores: 9 After calling the function num1 stores the bigger one: 12 num2 stores the smaller one: 9