dero[pdflmkdhgnmkebfswvrgio'jm

a를 1 증가시켜요

a++;

a+1; (x)

a = a+1; (o)

a +=1; -> a++;

a를 5증가시켜요

a = a+5;

a +=5;

icecream = icecream +5000;

or

icecream += 5000;