# Shiqianfeng JAVA classes against the war, March 23 #

On day 8 against the war Shiqianfeng learning classes;
JAVA_DAY6;
learned today of course there are loop structure;
Chinese world refuel refueling!!
I Come!

public class Java_day6{
	public static void main(String[]args){
				/*
		求1+3+...+99
		*/
		int i1=1;
		int sum1 = 0;
		while(i1<=99){
			sum1+=i1;
			i1 = 2*i1+1;
		}
		System.out.println("while语句得到:"+sum1);
		//++++++++++++++++
		int i2 = 1;
		int sum2 = 0;
		do{
			sum2+=i2;
			i2 = 2*i2+1;
		}while(i2<=99);
		System.out.println("dowhile语句得到的"+sum2);	
		//+++++++++++++++
		
		int sum3 = 0; 
		for(int i3 = 1;i3<=99;i3 = 2*i3+1){
			sum3+=i3;
		}
		System.out.println("for语句得到的"+sum3);
		
		/*
		行酒令:逢7过
		*/
		for(int i = 1;i<=100;i++){
			if(i%100/10==7||i%10==7||i%7==0){
				System.out.print("过  ");
			}else{
				System.out.print(i+"  ");
			}
		}
	}
}