分別用do-while和for循環計算1+1/2!+1/3!+1/4!+...的前20項的和(做業)

public class sran{ public static void main(String args[]){ double a=1,b=1,c=0; System.out.println("do-while循環:"); do{ c=b+c; a++; b=(1.0/a)*b; } while(a<=20); System.out.println(" "+c); System.out.pri

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