liwei.java

java课后题的详细答案

public class liwei {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		sum1();
		sum2();
		sum3();
		System.out.println(" **** OVER **** ");
	}
	public static void sum1(){
		int sum = 0 ;
		for(int i = 0 ; i < 10 ; i++)
			for(int j = 0 ; j < 10 ; j++)
				sum += i ;
		System.out.println(" sum1 = " + sum );
	}
	public static void sum2(){
		int sum = 0 ;
		int j = 0 ;
		do{
			j++ ; 
			for(int i = 5 ; i > j ; i--)
			{
				sum = sum + (i + j) ;
			}
		}while(j < 11);
		System.out.println(" sum2 = " + sum);
	}
	public static void sum3(){
		int sum = 0 ;
		int i = 0 ;
		while(i < 5)
		{
			int j = 5 ;
			while(i != j)
			{
				sum += j ;
				j-- ;
			}
			i++;
		}
		System.out.println(" sum3 = " + sum);
	}

}