Java-谈谈从一加到一百的那些事~~

单纯的从一加到一百，我用了while

package choer02;
public class jdkk {
	public static void main(String[] args) {
		int sum=0;
		int i=0;
		while(i<=99) {
		    i++;
		    sum+=i;
		  
		}
		System.out.println("1+2+...+100="+sum);	
		}
	}

一到一百以内的奇数相加

用while

package choer02;
public class jdkk {
	public static void main(String[] args) {
		int sum=0;
		int i=0;
		while(i<=99) {
		    i++;
		    sum+=i;
		    i++;
		}
		System.out.println("一到一百以内的奇数相加等于："+sum);	
		}
	}

试试do  while

package choer02;
public class jnok {
	public static void main(String[] args) {
		int i=1;
		int sum=0;
		do {
			sum+=i;
			i++;
			i++;
		}while(i<=100);	
		System.out.println("一到一百以内的奇数相加为："+sum);
		
	}

}

再用个for

package choer02;
public class jnok {
	public static void main(String[] args) {
		int sum=0;
		for(int i=1;i<=100;i++) {
			sum+=i;
			i++;
			
		}System.out.println("一到一百以内的奇数相加为："+sum);
		
	}

}

while那里加个判断

package choer02;
public class jdkk {
	public static void main(String[] args) {
		int sum=0;
		int i=0;
		while(i<=99) {
		    i++;
		    if(i%2==1) {
		    sum+=i;
		}else {
			
		}	i++;
		}System.out.println("一到一百以内的奇数相加等于："+sum);
	}
}

偶数的话改改就好啦

。。。