第五章函数—5.1.4讲学习笔记

//5-4-1//计算输入数字的位数#include <stdio.h>#include <stdlib.h>int length(int num){int length = 0;for (; num; num /= 10){length++;}return length;}void main(){int num;scanf_s("%d", &num);printf("数字的长度是：%d", length(num));system("pause");}

//5-4-2//计算1加到n的数值#include <stdio.h>#include <stdlib.h>int go(int num){if (num == 1){return 1;}else{return go(num - 1) + num;}}void main(){int data = 0;scanf_s("%d", &data);printf("%d", go(data));system("pause");}