#include <stdio.h>
int main()
{
    int i,score[i],n,max,min,sum=0,insearch,grade;
    double average;
    printf("请输入要统计的学生人数：\n");
    scanf("%d",&n);
    //平均值 
    for(i=0;i<n;i++)
    {
        printf("请输入学生成绩：\n");
        scanf("%d",&score[i]);
        sum+=score[i];
    }
    average=(double)sum/n;
    printf("平均值为%.2lf\n",average);
    //最大值
    insearch=0;
    max=score[0];
    for(i=1;i<n;i++)
    {
        if(score[i]>max)    
        {
            max=score[i];
            insearch=i;
        }
    } 
    printf("最高分为%d,该学生为第%d号\n",max,++insearch);
    //最小值 
    insearch=0;
    min=score[0];
    for(i=1;i<n;i++)
    {
        if(score[i]<min)    
        {
            min=score[i];
            insearch=i;
        }
    } 
    printf("最低分为%d,该学生为第%d号\n",min,++insearch);
    //寻找
    printf("输入你要找的分数：\n");
    scanf("%d",&grade); 
    for(i=0;i<n;i++)
    {
        if(grade==score[i])
        {
            insearch=i+1;
        }
    }
    printf("该学生的学号为%d",insearch);
    return 0;
}

#include <stdio.h>
#define N 11
int main()
{
    int num[N]={1,12,23,34,45,56,67,78,89,90},x,i,m;
    printf("请输入一个数：\n");
    scanf("%D",&x);
    for(i=0;i<=9;i++)
    {
        if(num[i]>x)
        {
            for(m=10;m>i;m--)
            {
                num[m]=num[m-1];
            }
            break;
        }
    }
    num[i]=x;
    for(i=0;i<N;i++)
    {
        printf("%d ",num[i]);
    }
    return 0; 
}

#include <stdio.h>
int main()
{
    int i1,i2,i3,n=0;
    int match[10]={6,2,5,5,4,5,6,3,7,6};
    for(i1=0;i1<=9;i1++)
    {
        for(i2=0;i2<=9;i2++)
        {
            for(i3=0;i3<=9;i3++)
            {
                if(i1+i2==i3&&match[i1]+match[i2]+match[i3]==12)
                {
                    printf("%d+%d=%d\n",i1,i2,i3);
                    n++;
                }
            }
        }
    }
    printf("一共有%d个",n);
    return 0;
}