int a=7 int b=9; decimal format df=new decimal format (' 0.00 ); system.out.println(df.format ) (float ) a/b ); int num1=7; int num2=9; //数字格式化对象numberformatnumberformat=number format.getinstance (; //正确设定到小数点后2位的number format.setmaximumfractiondigits (2; string result=number format.format () float ) num1/(float ) num2 * 100 ); system.out.println('num1和num2的百分比为:' result '% '; 输出结果
0.78num1和num2的百分比为:77.78%