//java阶乘求和1！+2！+····+n！
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int n = input.nextInt();
int t=0;//阶乘和
for (int j = 1; j < n+1; j++) {
int x = 1;//阶乘
for (int i = 1; i < j+1 ; i++) {
x = x * i;//求阶乘
}
t=t+x;//求阶乘和
}
System.out.println(t);
}
//java九九乘法表
public static void main(String[] args) {
for(int i=0;i<9;i++){
for(int j=0;j<i+1;j++){
int x =(i+1)*(j+1);
System.out.print((j+1)+"*"+(i+1)+"="+x);
System.out.print(" ");
}
System.out.println();
}
}
//用*打印一个等腰三角形
public static void main(String[] args) {
for (int i = 0; i < 9; i++) {
if (i < 4) {
for (int j = 0; j < i+1; j++) System.out.print("*");
}else{
for(int j=9;j>i;j--)System.out.print("*");
}
System.out.println();
}
//使用字母打印正三角形
public static void main(String[] args) {
String[] a = {"A", "B", "C", "D", "E", "F", "G"};
for (int i = 0; i < 7; i++) {
for (int j = 1; j < 14; j++) {
if (j < 7 - i || j > 7 + i) System.out.print(" ");
else System.out.print(a + " ");
}
System.out.println();
}}
//查找数组中的最大值与最小值，数组int[] a ={10,98,78,65,90,15,67};
public static void main(String[] args) {
int[] a = {10, 98, 78, 100, 90, 15, 67};
int max=a[0];
for (int j = 1; j < a.length - 1; j++) {
if(max<a[j])max=a[j];
}
System.out.println(max);
}
}
//冒泡排序算法
public static void main(String[] args) {
int[] a = {10, 98, 78, 100, 90, 15, 67};
int temp;
for (int j = 0; j < a.length - 1; j++) {
for (int i = 0; i < a.length - 1; i++) {
if (a > a[i + 1]) {
temp = a;
a = a[i + 1];
a[i + 1] = temp;
}
}
}
for (int i = 0;i < a.length;i++) {
System.out.println(a);
}
}
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