#include <stdio.h>
#include <stdlib.h>

extern "C" {
  int get_sum(int x,int y,int z);
}

void setup() {
  // put your setup code here, to run once:
  Serial1.begin(9600);
}

int main()
{
  int x,y,z,sum = 0;
  printf("\nEnter the first number: ");
  scanf("%d",&x);
  printf("%d",x);
  printf("\nEnter the second number: ");
  scanf("%d",&y);
  printf("%d",y);
  printf("\nEnter the third number: ");
  scanf("%d",&z);
  printf("%d",z);

  sum = get_sum(x,y,z);

  printf("\nThe sum of the numbers is: %d\n",sum);
  
  return 0;

}