编辑代码

#include <stdio.h>
int fun(int n)
{
    if(n==100) 
    return 100;
    else
    return n+fun(n+1);//1+2
}
int fun2(int n)
{
    if(n==1) 
    return 1;
    else
    return n*fun2(n-1);
}
int fun3(int m)
{
    if(m==1)
    return 1;
    else
    return m+fun3(m-2);
}
int fun4(int n)
{
    if(n==1||n==0)
    return n;
    else
    return fun4(n-1)+fun4(n-2);
}

int main () 
{
    int m,n,i;
    printf("请输入n的值：");
    scanf("%d",&n);
    
    printf("%d到100的和是%d",n,fun(n));
    printf("\n%d的阶乘%d",n,fun2(n));
    printf("\n%d以内的奇数和是%d",n,fun3(m));
    printf("\n%d数列是%d",n,fun4(n));
    printf("\n数列是");
    for(i=1;i<=n;i++)
    printf("%d   ",fun4(i));
}