import java.util.*;
class test_3 {
public static void main(String[] args) {
Scanner Sc = new Scanner(System.in);
System.out.println("请输入一个数据");
int x = Sc.nextInt();
int sum = getSum(x);
System.out.println("sum="+sum);
}
public static int getSum(int n){
if (n==1) {
return 1;
}
int temp = getSum(n-1);
return temp + n ;
}
}
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