~cpp 
#include <stdio.h>

int search_middleNum(int *, int *, int *);

void main()
{
	int a, b, c, middleNum;
	while(1){
		printf("멈추려면 '-999 0 0' 입력\n");
		printf("비교할 A, B, C 값을 차례로 입력 : ");
		scanf("%d %d %d", &a, &b, &c);
		if(a == -999){
			break;
		}
		middleNum = search_middleNum(&a, &b, &c);
		printf("중위수 = %d", middleNum);
	}
}

int search_middleNum(int *a, int *b, int *c)
{
	int middleNum_1, middleNum_2, i_1=0, i_2=0;

	middleNum_1=middleNum_2=(*a+*b+*c)/3;

	while (1){
		middleNum_1++;
		i_1++;
		if (middleNum_1==*a||middleNum_1==*b||middleNum_1==*c) break;
	}

	while (1){
		middleNum_2--;
		i_2++;
		if (middleNum_2==*a||middleNum_2==*b||middleNum_2==*c) break;
	}

	if (i_1<i_2) return middleNum_1;
	else return middleNum_2;
}

~cpp 
#include <stdio.h>

int search_middleNum(int *, int *, int *);

void main()
{
	int a, b, c, middleNum;
	while(1){
		printf("멈추려면 '-999 0 0' 입력\n");
		printf("비교할 A, B, C 값을 차례로 입력 : ");
		scanf("%d %d %d", &a, &b, &c);
		if(a == -999){
			break;
		}
		middleNum = search_middleNum(&a, &b, &c);
		printf("중위수 = %d", middleNum);
	}
}

int search_middleNum(int *a, int *b, int *c)
{
	int middleNum_1, middleNum_2;

	middleNum_1=middleNum_2=(*a+*b+*c)/3;

	while (1){
		if (middleNum_1==*a||middleNum_1==*b||middleNum_1==*c) return middleNum_1;
		if (middleNum_2==*a||middleNum_2==*b||middleNum_2==*c) return middleNum_2;
		middleNum_1++;
		middleNum_2--;
	}
}