Java 学习

package testdemo01;

/* head work  

 * sum,求出：1+2+3+...+99+100;之和，赋值给sum.

 */

public class TestDemo02 {
public static void main(String args[]) {
int a = 1;
int l = 1;
int jc = 1;
int sum = 0;
for (int i = 1; i <= 100; i++) {
sum = sum + i;// 进行累加。
System.out.println(sum);// 5050
}
// 5的阶乘
for (int i = 1; i <= 5; i++) {
jc = jc * i;
System.out.println("jc=" + jc);// 120
}
// 12的阶乘
for (int i = 1; i <= 12; i++) {
l = l * i;
System.out.println(l);// 479001600
}
// 8的阶乘
for (int i = 1; i <= 8; i++) {
a = a * i;
System.out.println(a);// 40320
}

}

}