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public class Jiecheng{
public static void main(String []args){
double a=1;
double b=0;
for(int i=1;i<=3;i++){
a=a*i;
b=b+a;
}
System.out.println(a);
System.out.println(b);
}
}
BigInteger bi_1 = new BigInteger("1");
BigInteger bi_2 = new BigInteger("0");
for(int i = 1;i<=30;i++) {
bi_1=bi_1.multiply(new BigInteger(String.valueOf(i)));
bi_2=bi_2.add(bi_1);
}
System.out.println(bi_2);
import java.math.BigInteger;
public class Test1 {
public static void main(String[] args) {
BigInteger sum = new BigInteger("0");
for (int i = 1; i <= 30; i++) {
sum = sum.add(getResult(i));
}
System.out.println("sum = " + sum);
}
public static BigInteger getResult(int num) {
BigInteger result = new BigInteger("1");;
for (int i = 1; i <= num; i++) {
result = result.multiply(new BigInteger(String.valueOf(i)));
}
return result;
}
}