北邮JAVA第三次作业科学计算器（附源代码）(8)

if(num2 != 0) { num1 = num1 / num2; num2 = 0;

big_num1 = big_num1.divide(big_num2,17,BigDecimal.ROUND_HALF_UP); big_num2 = new BigDecimal(0); opflag = false; num_txt = \ } break; case \

num1 = Math.pow(num1, num2); num2 = 0;

big_num1 = new BigDecimal(Double.toString(num1));

big_num2 = new BigDecimal(0); opflag = false; num_txt = \ break; case \

num1 = Double.parseDouble(num_txt); num1 = Math.sqrt(num1); num2 = 0;

big_num1 = new BigDecimal(Double.toString(num1));

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big_num2 = new BigDecimal(0);

num_txt = subZeroAndDot(Double.toString(num1)); break; case \

num1 = Double.parseDouble(num_txt); num1 = Math.log10(num1); num2 = 0;

big_num1 = new BigDecimal(Double.toString(num1));

big_num2 = new BigDecimal(0);

num_txt = subZeroAndDot(Double.toString(num1)); break; case \

num1 = Double.parseDouble(num_txt); num1 = Math.log(num1); num2 = 0;

big_num1 = new BigDecimal(Double.toString(num1));

big_num2 = new BigDecimal(0);

num_txt = subZeroAndDot(Double.toString(num1)); break;

default: opflag = false; num_txt = \ break; } } /**

* 使用java正则表达式去掉多余的.与0 * @param s * @return */

public static String subZeroAndDot(String s){ if(s.indexOf(\

s = s.replaceAll(\去掉多余的0 s = s.replaceAll(\如最后一位是.则去掉

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} return s; } }

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