20131006国庆作业例7-4,7-5,7-6

7-4

#include<stdio.h>
int main(void)
{
    int i,index,n;
    int a[10];
    printf("Enter n:");
    scanf("%d",&n);
    printf("Enter %d integers:",n);
    for(i=0;i<n;i++)
        scanf("%d",&a[i]);
    index=0;
    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;
}

 

7-5

 

#include<stdio.h>
int main(void)
{
    int i,index,k,n,temp;
    int a[10];
    printf("Enter n:");
    scanf("%d",&n);
    printf("Enter %d intgers:",n);
    for(i=0;i<n;i++)
        scanf("%d",&a[i]);
    for(k=0;k<n-1;k++){
        index=k;
        for(i=k+1;i<n;i++)
            if(a[i]<a[index]) index=i;
            temp=a[index];
            a[index]=a[k];
            a[k]=temp;
    }
    printf("After sorted:");
    for(i=0;i<n;i++)
        printf("%d",a[i]);
    printf("\n");

    return 0;
}

 7-6

运行结果1

 

结果2

#include<stdio.h>
int main(void)
{
    int a[10]={1,2,3,4,5,6,7,8,9,10};
    int low,high,mid,n=10,x;
    printf("Enter x:");
    scanf("%d",&x);
    low=0;high=n-1;
    while(low<=high){
        mid=(low+high)/2;
        if(x==a[mid])
            break;
        else if(x<a[mid])
            high=mid-1;
        else
            low=mid+1;
    }
    if(low<=high)
        printf("Index is %d\n",mid);
    else
        printf("Not Found\n");

    return 0;
}