How to move monsters in a C++ game?

I'm creating a dungeon crawler in C++ and I'm almost done but I need to make the monster move and I'm at the end of my wits.

This is my map:

Char Map[10][10];

and this is how I initialize the positions of the monsters:

void fieldinfo::RandomizeMonsterPositions()
{

    amountEnemies=10;
    srand(time(0));

    for(i=0; i        map[rand()%9][rand()%9] = enemy;
    }
}

fieldinfo is the name of my class.

Each time the player moves, the map is redrawn with the updated players position and I need the monster to move every time the player does (randomly or not I don't care).