numberedString = 1234567890123456789012345678901234567890;

numberedString = "1234567890123456789012345678901234567890";

offset = 0 ; // 初始偏移量为0

offset = 0; // initial offset is 0

fiveCounter = 0 ;

// 首先检查位置0是否有5。
if（strpos（

fiveCounter = 0; // First check if there is a "5" at position 0. if(strpos(