作业八

#include<stdio.h>
int main()
{
    int i;
    double average,sum=0;
    int a[10];
    
    printf("Enter 10 integers：");
    for(i=0;i<10;i++){
        scanf("%d",&a[i]);
        sum=sum+a[i];
    }
    average=sum/10;
    printf("average=%.2f\n",average);
    printf("sum=%.2f\n",sum);
    
    return 0;
}

#include<stdio.h>
int main()
{        
    int i,flag,x;
    int a [5];
    printf("enter 5 integers:");
    for(i=0;i<=5;i++)
    scanf("%d",&a[i]);
    printf("enter x:");
    scanf("%d",&x);
    flag=0;
    for(i=0;i<5;i++)
    if(a[i]==x){
        printf("index is %d\n",i);
        flag=1;
        break;
    }
    if(flag==0)
    printf("not found\n");
    return 0;
    
} 

#include<stdio.h>
int main()
{
    int i,index,n;
    int a[10];
    printf("enter n(1<n≤10):");
    scanf("%d",&n);
    printf("enter %d intergers:",n);
    for(i=1;i<=n;i++){
        scanf("%d",&a[i]);
    }
    for(i=1;i<=n;i++)
    if (a[i]>a[index])
    index=i;
    printf("min is %d\tsub is %d\n",a[index],index);
    return 0;
    
} 

#include<stdio.h>
int main()
{    
    int i,index,j,n,temp;
    int a[10];
    printf("entern n(1<n≤10):");
    scanf("%d",&n);
    printf("enter %d integers:",n);
    for(i=0;i<n;i++)
    scanf("%d",&a[i]);
    for(j=0;j<n-1;j++)
    {
        index=j;
        for(i=j+1;i<n;i++)
        if(a[i]>a[index])
            index=i;
        temp=a[index]; 
        a[index]=a[j];
        a[j]=temp;
    }
        printf("after sorted:");
        for(i=0;i<n;i++)
        printf("%d",a[i]);
          printf("\n");
    
    return 0;
}