创建控制台项目;
主函数之外写入类;
public class forDemo{//循环public int Sum(int x){int result = 0;for (int i = 1; i < x+1; i++){result = result + i;}return result;}//递归实现了; public int Sum2(int x){if (x == 1){return 1;}else{int result = x + Sum2(x - 1);return result;}}}}public class DiGui{//一个函数可以调用自己; 递归; 个人搞个人犹如? public void PrintTo(int x){if (x == 1){