#include <stdio.h>
 
typedef struct
{
  int x;
  int y;
} TwoInts;
 
TwoInts readInts()
{
  TwoInts toReturn;
  while( scanf("%d %d",&toReturn.x,&toReturn.y) != 2 )
  {
  	char c;
    while ((c = getchar()) != '\n' && c != EOF); // limpieza del buffer de entrada
    printf("ERROR: Uno de los valores no era un número. Intentalo de nuevo: ");
  }
 
  return toReturn;;
}
 
int main()
{
  puts("Introduzca dos números: ");
  TwoInts twoInts = readInts();
 
  int z = twoInts.x + twoInts.y;
  printf("Resultado: %d\n",z);
}

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