Please help me to solve these errors of sudoku program in c++

See more:

C++

hi , it is my Sudoku code . it has 2 errors but everything i search i can't solve this error . i need your kind helping to solve these errors to can run my program.

#include <iostream>
#include <conio.h>

int a[9][9], b[9][9];
int inputvalue(int x, int y, int value)
{
	//scanning horizontally and vertically
	for (int i = 0; i < 9; i++)
	{
		if (value == b[x][i] || value == b[i][y])
			return 0;
	}
	//scanning its owne squares
	for (int i = (x / 3) * 3; i <= ((x / 3) * 3) + 2; i++)
	for (int j = (y / 3) * 3; j <= ((y / 3) * 3) + 2; j++)
	if (b[i][j] == value)
		return 0;
	return value;
}

int solve(int x, int y)
{
	int temp;
	if (b[x][y] == 0)
	{
		for (int i = 1; i < 10; i++)
		{
			temp = inputvalue(x, y, i);
			if (temp>0)
			{
				b[x][y] = temp;
				if (x == 8 && y == 8)
					return 1;
				else if (x == 8)
				{
					if (solve(0, y + 1))
						return 1;
				}

				else
				{
					if (solve(x + 1, y))
						return 1;
				}

			}
			if (i == 10)
			{
				if (b[x][y] != a[x][y])
					b[x][y] = 0;
				return 0;
			}
		}
		if (x == 8 && y == 8)
			return 1;
		else if (x == 8)
		{
			if (solve(0, y + 1)) return 1;
		}
		else
		{
			if (solve(x + 1, y)) return 1;
		}

	}
	return 0;
}

void gotoxy(int i, int i1);

int main()
	{

		int i, j;
		for ( i = 0; i < 9; i++)
		for ( j = 0; j < 9; j++)
		{
			gotoxy(i + 1, j + 1);
			std::cin>> a[i][j];
		}
		for ( i = 0; i < 9; i++)
		for (j = 0; j < 9; j++)
			b[i][j] = a[i][j];

		if (solve(0, 0))
		{
			for (i = 0; i < 9; i++)
			for ( j = 0; j < 9; j++)
			{
				gotoxy(i + 1, j + 1);
				std::cout << b[i][j];
			}
		}
		else
			std::cout << "no soln";
		
			_getch();
			return 0;
	}

the errors are:

1)error LNK2019: unresolved external symbol "void __cdecl gotoxy(int,int)" (?gotoxy@@YAXHH@Z) referenced in function _main

2)error LNK1120: 1 unresolved externals


thanks

What I have tried:

i have tried a lot via re sharper and google . but i don't know what to do anmore .please help me pleaseeee