double sum = 1.00;
for(int i = 1; i <= 30; i++){
int num = F(a);
sum += num;
}
System.out.println("sum = " + sum);
}
public static double F(int num){
for(int i = 1; i <= num; i++){
int a = 1;
a = a * i;
}
return a;
------解决方案--------------------
求阶乘要用BigInteger，30！用long早就越界了
- Java code
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; }}