연산 (곱셈, 분수)

1.

public class chp4_8_7_1 {
	public static void main(String[] args) {
		int i,j,s=0,sum;
		
		for(i=1; i<=10; i++) {
			sum=1;
			for(j=1; j<=i; j++)
				sum *= j;
			s += sum;
		}
		System.out.println(s);
	}
}

 

2.

public class chp4_8_7_2 {
	public static void main(String[] args) {
		int i;
		double s=0;
		
		for(i=1; i<=10; i++) {
			if(i%2==0)
				s -= 1.0/i;
			else
				s += 1.0/i;
		}
		System.out.println(s);
	}
}