java - 我怎样才能让它执行到小数点后两位，结果是长十进制

Question

这个问题已经有答案了:

Java: double: how to ALWAYS show two decimal digits (7 个回答)

已关闭 8 年前。

int ptstotal, ptsearned, ptssofar;
ptstotal= 1500;
ptsearned= 750;
ptssofar= 950;

System.out.println("The current percentage is "+(int)Math.round(ptsearned*1)/(double)(ptssofar)*100+"%.");

System.out.println("The current percentage is "+Math.round(ptsearned*1)/(double)ptssofar*100+"%.");

输出是一个长十进制78.96736805263%，只需要78.97%需要一些帮助

Answer 1

尝试使用 printf 代替

double value = (int)Math.round(ptsearned*1)/(double)(ptssofar)*100;
System.out.printf("The current percentage is %.2f %",value);