Copy the contents of the array-of-double into three other arrays. - C Pointer

C examples for Pointer:Array Pointer

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Description

Copy the contents of the array-of-double into three other arrays.

Demo Code

#include <stdio.h>
#define LENGTH 5/*from   w  ww  . ja  va 2 s .c  o m*/

void copy_arr(double *target, double *source, int arr_len); // copy with array notation
void copy_ptr(double *target, double *source, int arr_len); // copy with pointer notation
void copy_ptrs(double *target, double *source_start, double *source_end); // copy with two pointers

int main(void)
{
  double source[LENGTH] = {1.1, 2.2, 3.3, 4.4, 5.5};
  double target1[LENGTH];
  double target2[LENGTH];
  double target3[LENGTH];

  copy_arr(target1, source, LENGTH);
  copy_ptr(target2, source, LENGTH);
  copy_ptrs(target3, source, source + LENGTH);

  printf("%15s|%15s|%15s\n", "target1", "target2", "target3");
  for (int i = 0; i < LENGTH; i++)
    printf("%15.3f|%15.3f|%15.3f\n", target1[i], target2[i], target3[i]);

  return 0;
}

void copy_arr(double *target, double *source, int arr_len)
{
  // copy array using array notation

  for (int i = 0; i < arr_len; i++)
  {
    target[i] = source[i];
  }
}

void copy_ptr(double *target, double *source, int arr_len)
{
  // copy array using pointer notation

  for (int i = 0; i < arr_len; i++)
  {
    *(target + i) = *(source + i);
  }
}

void copy_ptrs(double *target, double *source_start, double *source_end)
{
  // copy arr using pointer notation and pointer endpoint

  for (double *ptr = source_start; ptr < source_end; ptr++, target++)
    *target = *ptr;
}

Result


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