n=n>=(count-1)?0:

n=n>=(count-1)?0:
n=n>=(count-1)?0:

n=n>=(count-1)?0:
这是c语言里的条件运算,当n大于等于count-1时,n=0；否则n=n+1

if( n>= count-1) n = 0;
else n = n++