30001总吨至70000总吨的部分，每总吨增加600计算单位；
fprintf(stderr, "Failed to open data.txt\n");，这一点在新收录的资料中也有详细论述
The simple answer is "We don't know". The solution is to verify the address. My challenge here is, why even allow this to be a potential scenario? Why don't we utilise the type system to ensure correctness?，推荐阅读新收录的资料获取更多信息
The stealth upgrade.