Analysis:
Use the for loop, the outer for loop determines the number of sums, and the inner for loop determines the factorial result for each time.
program:
public class Demo02ForTest {
public static void main(String[] args) {
int i,j,mul,sum =0;
for ( i = 1; i <= 10 ; i++) {
mul = 1;
for ( j = 1; j <=i ; j++) {
mul = mul * j;
}
sum = sum + mul;
}
System.out.println("1！+2！+...+10!之和：" + sum);
}
}
Program demonstration:
