question what exactly does "n total" mean and do? never heard of anything like that before i think i am doing something wrong

i put the int nTotal = 0; to the top where i declare all my other stuff like int i,j;

and then nTotal += maatriks[i][3]); inside one of the loops? wow i just relized it is probably hard for you to understand half of my code because a lot of the words are written in first language