Movement issues, skipping fields - c

Question

I'm making a game, where you (the player) are represented by a number in a 2D matrix. The problem is that when I move the player, it skips fields, and does not respond very well. The movement is very inaccurate. If you could run the program, you could get a better understanding of the issue. How can I fix this problem?
#include <stdio.h>
#include <windows.h>
#include <time.h>
void delay(unsigned int mseconds)
{
clock_t goal = mseconds + clock();
while (goal > clock())
;
}
int map[5][5] = {{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0}};
int mUpdate(int x)
{
int i, j;
for (i = 0; i < 5; i++)
{
for (j = 0; j < 5; j++)
{
printf("%d ", map[i][j]);
}
printf("\n");
}
}
int mRefresh(int x)
{
int i, j;
for (i = 0; i < 5; i++)
{
for (j = 0; j < 5; j++)
{
if (map[i][j] > 0)
{
map[i][j] = 0;
}
}
}
}
int main()
{
int c;
int i, j;
int p_num;
printf("Hey! Choose a number from 1-9 that will represent you!: ");
scanf("%d", &p_num);
printf("Choose a starting position by inputting two coordinates from 1-4!: ");
scanf("%d %d", &i, &j);
printf("\nVery well, this is your starting position!\n");
map[i][j] = p_num;
mUpdate(map[i][j]);
printf("\nYou are now the number %d !\n", p_num);
printf("\nPlease wait for the map to load!");
printf("\nMap loading will start soon!");
delay(3000);
for (c = 0; c < 5; c++)
{
printf("\nLoading.");
delay(500);
system("cls");
printf("\nLoading..");
delay(500);
system("cls");
printf("\nLoading...");
delay(500);
system("cls");
}
printf("Map loaded!\n");
printf("\nUse arrow keys to move thru the matrix!\n");
mUpdate(map[i][j]);
int game_running = true;
while (game_running = true)
{
if (GetAsyncKeyState(VK_DOWN))
{
// delay(200);
map[i++][j] = p_num;
system("cls");
mUpdate(map[i][j]);
mRefresh(map[i][j]);
}
else if (GetAsyncKeyState(VK_UP))
{
// delay(200);
map[i--][j] = p_num;
system("cls");
mUpdate(map[i][j]);
mRefresh(map[i][j]);
}
else if (GetAsyncKeyState(VK_RIGHT))
{
// delay(1000);
map[i][j++] = p_num;
system("cls");
mUpdate(map[i][j]);
mRefresh(map[i][j]);
}
else if (GetAsyncKeyState(VK_LEFT))
{
// delay(200);
map[i][j--] = p_num;
system("cls");
mUpdate(map[i][j]);
mRefresh(map[i][j]);
}
}
system("cls");
}