Passing the data type addess into the function

#include <stdio.h>
void swap(int *x, int *y);

int main(void)
{
  int i, j;

  i = 10;
  j = 20;

  printf("i and j before swapping: %d %d\n", i, j);

  swap(&i, &j); /* pass the addresses of i and j */

  printf("i and j after swapping: %d %d\n", i, j);

  return 0;
}

void swap(int *x, int *y)
{
  int temp;

  temp = *x;  /* save the value at address x */
  *x = *y;    /* put y into x */
  *y = temp;  /* put x into y */
}

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Passing the data type addess into the function : Function Parameters « Function « C / ANSI-C

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