game of life help please

Hello,

I have to do for school a game named "game of life". I have a network in which are some cells alive( matric, where are live cells marked with 1 and other with 0). Rules of survival are simple:

a)if has live cell less than 2 neighbours dies of loneliness

b)if has live cell more than 3 neighbours dies from overpopulation

c)if has dead cell exactly 3 neighbours it became alive

i really don't know how to do this..:( sorry Please help me i would be very gratefull everybody.