第九次作业

#include<stdio.h>
#define N 100
void readscore(int score[],int n);
double average(int grade[],int n);
int maxindex(int grade[],int n);
int minindex(int grade[],int n);
int search(int num[],int n,int x);
void bubblesort(int grade[],int n);
void printscore(int grade[],int n);
int main()
{
    int score[N],n,max,min,m,num,x;
    double ave;
    printf("Please input the number of the students:\n");
    scanf("%d",&n);
    readscore(score,n);
    ave=average(score,n);
    max=maxindex(score,n);
    min=minindex(score,n);
    printf("The average of the grade is %.2f,The maxindex is %d,The minindex is %d\n",ave,max,min);
    printf("Please input the grade of the student.\n");
    scanf("%d",&x);
    m=search(score,n,x);
    printf("This students index is%d\n",m);
    bubblesort(score,n);
    printscore(score,n);
    return 0;
}
void readscore(int score[],int n)
{
    int i;
    printf("Please input the score:\n");
    for(i=0;i<n;i++)
    {
        scanf("%d",&score[i]);
    }
}
double average(int score[],int n)
{
    int i;
    double sum;
    sum=0;
    for(i=0;i<n;i++)
    {
        sum+=score[i];
    }
    return (double)sum/n;
}
int maxindex(int score[],int n)
{
    int i,maxindex=0;
    for(i=1;i<n;i++)
    {
        if(score[i]>score[maxindex])
        {
            maxindex=i;
        }
    }
    return maxindex;
}
int minindex(int score[],int n)
{
    int i,minindex=0;
    for(i=1;i<n;i++)
    {
        if(score[i]<score[minindex])
        {
            minindex=i;
        }
    }
    return minindex;
}
int search(int num[],int n,int x)
{
    int i;
    for(i=0;i<n;i++)
    {
        if(num[i]==x)
        {
            return i;
        }
    }
    return -1;
} 
void bubblesort(int score[],int n)
{
    int i,j,t,flag;
    for(i=0;i<n-1;i++)
    {
        flag=0;
        for (j=0;j<n-1;j++)
        {
            if(score[j]>score[j+1])
            {
                t=score[j];
                score[j]=score[j+1];
                score[j+1]=t;
                flag=1;
            }
        }
        if(flag==0)
        {
            break;
        }
    }
}
void printscore(int score[],int n)
{
    int i;
    for(i=0;i<n;i++)
    {
        printf("%5d",score[i]);
    }
    printf("\n");
} 

#include<stdio.h>
#define N 100
int main()
{
    int i,num[N]={0},a=0;
    for(i=0;i<N;i++)
    {
        num[i]=i+1;
    }
    for(i=0;i<N;i++)
    {
        if(num[i]%3==0||num[i]%7==0)
        {
            num[i]=0;
        }
        else
        {
            a++;
            printf("%5d\n",num[i]);
        }
    }
    printf("It remaid %d numbers",a);
    return  0;
}