Java程序:
public class Main {
public static void main(String[] args){
System.out.println(sum(2, 5));
}
public static int sum(int n1, int n2) {
if(n1 == n2) {
return n1;
}
if(n1 > n2) {
int temp = n1;
n1 = n2;
n2 = temp;
}
return sum(n1, n2-1) + n2;
}
}
运行测试:
14
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