实验5

#include <stdio.h>
#define N 5

void output(int x[], int n);

int main()
{
    int x[N] = {9, 55, 30, 27, 22};
    int i;
    int k;     
    int t;      

    printf("original array:\n");
    output(x, N);

    k = 0;
    for(i=1; i<N; ++i)
        if(x[i] > x[k])
            k = i;

    if(k != N-1)
    {
        t = x[N-1];
        x[N-1] = x[k];
        x[k] = t;
    }
    
    printf("after swapped:\n");
    output(x, N);

    return 0;
}

void output(int x[], int n)
{
    int i;

    for(i=0; i<n; ++i)
        printf("%d ", x[i]);
    
    printf("\n");
}

 

 

#include <stdio.h>
#define N 5

void output(int x[], int n);

int main()
{
    int x[N] = {9, 55, 30, 27, 22};
    int i;
    int t;      // 用作交换两个数组元素的中间变量

    printf("original array:\n");
    output(x, N);

    for(i=0; i<N-1; ++i)
        if(x[i] > x[i+1])
        {
            t = x[i];
            x[i] = x[i+1];
            x[i+1] = t;
        }

    
    printf("after swapped:\n");
    output(x, N);

    return 0;
}

void output(int x[], int n)
{
    int i;

    for(i=0; i<n; ++i)
        printf("%d ", x[i]);
    
    printf("\n");
}

 

 

#include <stdio.h>
#define N 5

void output(int x[], int n);

int main()
{
    int x[N] = {9, 55, 30, 27, 22};
    int i;
    int t;      // 用作交换两个数组元素的中间变量

    printf("original array:\n");
    output(x, N);

    for(i=0; i<N-1; ++i)
        if(x[i] > x[i+1])
        {
            t = x[i];
            x[i] = x[i+1];
            x[i+1] = t;
        }

    
    printf("after swapped:\n");
    output(x, N);

    return 0;
}

void output(int x[], int n)
{
    int i;

    for(i=0; i<n; ++i)
        printf("%d ", x[i]);
    
    printf("\n");
}

 

 

#include <stdio.h>

#define N 5

int binarySearch(int x[], int n, int item); // 函数声明

int main()
{
    int a[N] = {2, 7, 19, 45, 66};
    int i, index, key;

    printf("数组a中的数据:\n");
    for (i = 0; i < N; i++)
        printf("%d ", a[i]);
    printf("\n");

    printf("输入待查找的数据项: ");
    while(scanf("%d", &key)!=EOF){
        
    index = binarySearch( a , N , key); 

    if (index >= 0)
        printf("%d 在数组中，下标为%d\n", key, index);
    else
        printf("%d 不在数组中\n", key);
}
    return 0;
}

int binarySearch(int x[], int n, int item)
{
    int low, high, mid;

    low = 0;
    high = n - 1;

    while (low <= high)
    {
        mid = (low + high) / 2;
        if (item == x[mid])
            return mid;
        else if (item < x[mid])
            high = mid - 1;
        else
            low = mid + 1;
    }

    return -1;
}

 

 

#include <stdio.h>
#include <string.h>
#define N 5

void selectSort(char str[][20], int n); // 函数声明，两维数组作为函数参数

int main()
{
    char name[][20] = {"Bob", "Bill", "Joseph", "Taylor", "George"};
    int i;

    printf("输出初始名单:\n");
    for (i = 0; i < N; i++)
        printf("%s\n", name[i]);

    selectSort(name, N); // 调用选择法对name数组中的字符串排序

    printf("按字典序输出名单:\n");
    for (i = 0; i < N; i++)
        printf("%s\n", name[i]);

    return 0;
}

// 函数定义
// 函数功能描述：使用选择法对二维数组str中的n个字符串按字典序排序
void selectSort(char str[][20], int n)
{
   int i,j;
   char temp[10];
   for(i=0;i<n;i++){
           for(j=i+1;j<n;j++)
               if(strcmp(str[j],str[i])<0){
                       strcpy(temp,str[j]);
                       strcpy(str[j],str[i]);
                       strcpy(str[i],temp);
                     }
                }
}

 

 

#include <stdio.h>

int main()
{
    int n;
    int *pn;

    n = 42;
    pn = &n;

    printf("%#x: %d\n", &n, n);
    printf("%#x: %#x\n", &pn, pn);
    printf("%d\n", *pn);

    return 0;
}

 

 

#include <stdio.h>

#define N 5

int main()
{
    int a[N] = {1, 9, 2, 0, 7};
    int i;
    int *p;

    for(i=0; i<N; ++i)
        printf("&a[%d] = %#x,  a[%d] = %d\n", i, &a[i], i, a[i]);
    
    printf("\n");

    for(i=0; i<N; ++i)
        printf("a+%d = %#x,  *(a+%d) = %d\n", i, a+i, i, *(a+i));
    
    printf("\n");

    p = a;
    for(i=0; i<N; ++i)
        printf("p+%d = %#x,  *(p+%d) = %d\n", i, p+i, i, *(p+i));
     
    return 0;
}