namespace std;

int main()
{
	int a;
	int b;
	ifstream f("adunare.in");
	ofstream g("adunare.out");
	f >> a;
	f >> b;
	g << a + b << endl;
	return 0;
}

Sau la asta:
Cod:


int main()
{
	int a;
	int b;
	FILE* f= fopen("adunare.in", "rt");
	FILE* g = fopen("adunare.out", "wt");
	fscanf(f, "%d", &a);
	fscanf(f, "%d", &b);
	fprintf(g, "%d\n", a + b);
	fclose(f); 
	fclose(g);
	return 0;
}