(1) 九九乘法表
public class chengfa {
public static void main(String[] args) {
for(int i = 1; i <= 9; i++)
{
for(int j = 1; j <= i; j++) {
System.out.print( i + "*" + j + "=" + (i * j)+" ");
}
System.out.println(" ");
}
}
}
(2) 1~100的和
//2.计算1+2+3+。。。。+100的结果
int sum = 0;
int i = 1;
while (i<=1000)
{
sum+=i;
i++;
}
System.out.println("1+2+3+...+100="+sum);
(3) 1~100 奇数的和
//3.计算1-100之内的所有奇数的和
int i=1;
int sum = 0;
while (i<=100)
{
if(i%2!=0)
{
sum+=i;
}
i++;
}
while (i<=100)
{
sum+=i;
i+=2;
}
System.out.println("1+3+5+..+99="+sum);
(4) 1~100 偶数的和
//3.计算1-100之内的所有奇数的和
int i=1;
int sum = 0;
while (i<=100)
{
if(i%2==0)
{
sum+=i;
}
i++;
}
while (i<=100)
{
sum+=i;
i+=2;
}
System.out.println("0+2+4+..+100="+sum);