#include <stdio.h>
int main()
{
    int n,i,a,sum=0;
    printf("请输入几个数：");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        printf("请输入你所输入的数："); 
        scanf("%d",&a);
        if(a%2!=0)
        {
            sum=sum+a;
        }
    }
    printf("n个奇数的和为: %d",sum);
    return 0;
} 

#include<stdio.h>
double mypow()
{
    double x,a=1;
    int n,i;
    printf("请依次输入x和n的值:");
    scanf("%lf %d",&x,&n);
    for(i=1;i<=n;i++)
        a=a*x;
    printf("%.2f的%d次方为:%.2f",x,n,a);
}
int main()
{
    mypow();
    return 0;
}

#include<stdio.h>
double cylinder(double r,double height)
{
    double v;
    v=3.14*r*r*height;
    return v;
}
int main()
{

double r,height;
    printf("请输入圆柱体的半径和高度:");
    scanf("%lf %lf",&r,&height);
    cylinder(r,height);
    printf("%.3f\n",result);
    return 0;