#include <stdio.h>
double mypow(double x,int n)
{
    int i;
    for(i=0;i<n;i++)
    mypow*=x;
}
int mian()
{
    int i,n;
    double mypow=1.0,x;
    printf("输入x和n:");
    scanf("%lf%d",&x,&n);
    mypow*=x;
    printf("%.2f\n",mypow(double x,int n));
    return 0;
}

#include<stdio.h>
double cylinder(double r,double height)
{
     double v;
     v=3.14*r*r*height;
}
int main()
{
     double r,height,v;
     printf("请输入圆柱体的半径和高:") ;
     scanf("%lf %lf",&r,&height);
     v=3.14*r*r*height;
     cylinder(r,height);
     printf("圆柱体体积为:%lf",v);
     return 0;
}

#include<stdio.h>
int OddSum(int x)
{
    int sum=0;
    if(x%2==0) 
        x=0;
    else
        sum=sum+x;
    return sum;    
}
int main() 
{
    int i,n;
    printf("请输入n个数：");
    scanf("%d",&x);
    for(i=0;i<=x;i++)
    printf("奇数和为："); 
    return 0;
}