java - 我怎么能执行到小数点后两位，长十进制出来

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Java: double: how to ALWAYS show two decimal digits
                                
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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％就需要一些帮助

最佳答案

尝试改用printf

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