Java while语句练习 C语言的函数递归

1.

/* public static void main(String[] args) {int[] arr = {25, 24, 12, 98, 36, 45};int max = arr[0];//不能写0for (int i = 1; i < arr.length; i++) {if (arr[i] > max) {max = arr[i];}}System.out.println(max);}*//*public static void main(String[] args) {double height=8844330;double paper=0.1;int num=0;while (paper<=height){paper=paper*2;num++;}System.out.println(num);}*///求倒过来的数，若为回数，则为true/*public static void main(String[] args) {int number=9875;int temp=number;//记录一开始的输入值int num=0;while (number!=0){int ge=number%10;number=number/10;num =num*10+ge;}System.out.println(num);System.out.println(num==temp);}*///只能用+-，算出商和余数/*public static void main(String[] args) {int a=9999999;int b=4;int num=0;while (a>=b){a=a-b;num++;}System.out.println("商为"+num);System.out.println("余数为"+a);}*///do while语句 先执行，后判断

2.

#include<stdio.h>
int fac(int n);
int main(void)
{
    int m = 0;
    printf("请输入m的值：");
    scanf_s("%d", &m);
    printf("%d\n", fac(m));
    return 0;
}
int fac(int n)
{
    if (n < 1)
        return -1;
    else if (n == 1)
        return 1;
    else
    return n+fac(n-1);//一直循环fac()函数，直到n==1
}