1.用while,do while,for循环实现100以内（含100）的偶数加和

//1.while循环
int i=0;
int sum=0;
while(i<=100){
i++;
if(i%2==0){
sum=sum+i;
}
}
System.out.println(“100以内偶数和为：”+sum);
}
//2.do while
int i=0;
int sum=0;
do{
i++;
if(i%2==0){
sum=sum+i;
}
}while(i<=100);
System.out.println(sum);
}
//3.for 循环
int sum=0;
for(int i=0;i<=100;i++){
if(i%2==0){
sum=sum+i;
}
}System.out.println(“一百以内偶数和为”+sum);
}
}