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");
}