#include <stdio.h> 

int arr[5]={1,2,3,4,5}; 

void displayData(void){
  int i;
  //display initial value
  printf("Displaying array values.\n");
  for(i=0; i<5;i++){
    printf("%d\n", arr[i]); 
  }
  printf("Done.\n");
}

void updateData(void){
  int indexnumber, arrayvalue;
  //set new value
  printf("Enter array index number to edit:\n");
  scanf("%d",&indexnumber);
  printf("Enter new value:\n");
  scanf("%d",&arrayvalue);  
  arr[indexnumber-1]=arrayvalue;
}

int main(void) { 
  displayData();
  updateData();
  displayData();

  return 0; 
}