1. Topic requirements:
Find the factorial sum of 1~n numbers, where n is the number entered by the keyboard.
Second, the knowledge that needs to be mastered:
1. Scanner keyboard input technology
2. Method definition and call
3. Implementation method
Define a method, use a loop in the method, and use a loop to call repeatedly when calling
Fourth, implement the code
public class TestJiecheng {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Please enter an integer: ");
int n = scanner.nextInt();
System.out.println("The factorial sum of this integer is: " + circulation(n));
}
//Circulation method
public static int circulation(int n) {
int sum = 0;
int num = 1;
for (int i = 1; i <= n; i++) {
num*= i;
sum+=num;
}
return sum;
}
}
5. Output result
ps: I am a novice, a beginner in Java, and I am still immature. If there is anything wrong, I would like to ask the masters from all walks of life to give me advice and give me some advice, and I will listen to it when I make up my mind!