insert an element at the end of an array in C

  int array[max_size] = {1,2,3};
  int arraySize = 3; //Including the existing elements
  int newElement = 4;

  array[arraySize] = newElement;
  arraySize++;

This code inserts an element at the end of an array in C. First, the array is declared and initialized with existing values. Next, the size of the array is declared, which is the number of elements it currently contains. Finally, the desired new element is declared.

The new element is then added to the end of the array by assigning it to the array index of the current size. The size is then increased by one to reflect the new element that was added.