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

//~ int avg(int a, int b)
//~ {
	//~ if (abs(a) < abs(b))
		//~ return a + (b - a) / 2;
	//~ else
		//~ return b + (a - b) / 2;
//~ }

int avg(int a, int b)
{
	return abs(a) < abs(b) ? a + (b - a) / 2 : b + (a - b) / 2;
}

//~ int avg(int a, int b)
//~ {
    //~ if (sign(a) != sign(b))
        //~ return (a + b) / 2;
    //~ else
        //~ return a + (b - a) / 2;
//~ }

//~ int avg(int a, int b)
//~ {
	//~ if (((a > 0) && (b > 0)) || ((a < 0) && (b < 0)))
		//~ return a + (b - a) / 2;
	//~ else
		//~ return (a + b) / 2;
//~ }

int main(int argc, char *argv[])
{
	int ab[][2] = {
		{3, 3},
		{3, 4},
		{4, 4},
		{4, 5},
		{5, 5},
		{5, 4},
		{4, 3},
		{-3, 3},
		{-3, 4},
		{-4, 4},
		{-4, 5},
		{-5, 5},
		{-5, 4},
		{-4, 3},
		{3, -3},
		{3, -4},
		{4, -4},
		{4, -5},
		{5, -5},
		{5, -4},
		{4, -3},
		{-3, -3},
		{-3, -4},
		{-4, -4},
		{-4, -5},
		{-5, -5},
		{-5, -4},
		{-4, -3}
	};

	size_t i;

	for (i = 0; i < sizeof(ab) / 2 / sizeof(int); i++) {
		int iavg = avg(ab[i][0],ab[i][1]);
		int davg = ((double)ab[i][0] + (double)ab[i][1]) / 2.0;

		if (iavg != davg)
			printf("avg(%d, %d) = %d (верное = %d)\n", ab[i][0], ab[i][1], avg(ab[i][0],ab[i][1]), davg);
	}


	return 0;
}