实验4

task1_1.cask1_1.c
#include <stdio.h>
#define N 4
int main()
{
    int a[N] = { 2, 0, 2, 2 };
        char b[N] = { '2', '0', '2', '2' };
    int i;
    printf("sizeof(int)=%d\n", sizeof(int));
    printf("sizeof(char) = %d\n", sizeof(char));
    printf("\n");


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


    for (i = 0; i < N; ++i)
        printf("%p：%c\n", & b[i], b[i]);
    printf("\n");


    printf("a=%p\n", a);
    printf("b= %p\n", b);


    return 0;
}

task1_2.c

#include <stdio.h>
#define N 2
#define M 3
int main()
{
    int a[N][M] = { {1, 2, 3} , {4, 5, 6} };
    char b[N][M] = { {'1', '2', '3'}, {'4', '5', '6'} };
    int i, j;


for (i = 0; i < N; ++i)
    for (j = 0; j < M; ++j)
        printf("%p：%d\n", & a[i][j], a[i][j]);


printf("\n");


for (i = 0; i < N; ++i)
    for (j = 0; j < M; ++j)
        printf("%p：%c\n", & b[i][j],b[i][j]);

return 0;
}

 实验任务2

#include<stdio.h>
int days_of_year(int year, int month, int day);
int main()
{
    int year, month, day;
    int days;
    while (scanf_s("%d%d%d", &year, &month, &day) != 0)
    {
        days = days_of_year(year, month, day);
        printf("%4d-%02d-%02d是这一年的第%d天.\n\n", year, month, day, days);
    }
    return 0;
}

int days_of_year(int year, int month, int day)
{
    int a[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 },i, s= 0;
    
    for (i = 1; i < month; i++)
    {
        s=s+ a[i];
    }
    s =s + day;
    if(year % 4 == 0 || year%100==0&&year % 400 == 0)
    {
        s++;
    }
    return s;
}

实验任务3

#include <stdio.h>
#define N 5

void input(int x[], int n);
void output(int x[], int n);
double average(int x[], int n);
void sort(int x[], int n);
int main()
{
    int scores[N];
    double ave;

    printf("录入%d个分数：\n",N);
    input(scores, N);

    printf("\n输出课程分数：\n");
    output(scores, N);

    printf("\n课程分数处理：计算均分、排序..\n");
    ave = average(scores, N);
    sort(scores, N);

    printf("\n输出课程均分：%.2f\n",ave);
    printf("\n输出课程分数(高->低)：\n");
    output(scores, N);

    return 0;
}
void input(int x[], int n)
{
    int i;
    for (i = 0; i < n; ++i)
        scanf_s("%d", &x[i]);
}
    void output(int x[], int n)
    {
        int i;
    for (i = 0; i < n; ++i)
        printf("%d ",x[i]);
    printf("\n");
}

    double average(int x[], int n)
    {
        int i;
        float a,s=0;
        for (i = 0; i < n; ++i)
        {
            s += x[i];
        }
        a = s / n;
        return a;
    }

    void sort(int x[], int n)
    {
        int i, j, t;
        for (i = 0; i < n - 1; i++) {
            for (j = 0; j < n - 1; j++) {
                if (x[j] < x[j + 1]) {
                    t = x[j];
                    x[j] = x[j + 1];
                    x[j + 1] = t;
                }
            }
        }

    }

 

#include <stdio.h>
void dec2n(int x, int n);
int main()
{
    int x;
    printf("输入一个十进制整数：");
        scanf_s("%d", &x);
        dec2n(x, 2);
        printf("\n");
        dec2n(x, 8);
        printf("\n");
        dec2n(x, 16);
        return 0;
}

void dec2n(int x, int n)
{
    int a, b; char c[17] = { "0123456789ABCDEF" };
        a = x / n;
        b = x % n;
     if (a == 0)
             {
                 printf("%c", c[b]);
            }
        else
            {
                dec2n(a, n);
                 printf("%c", c[b]); 
     }
}

     

#include<stdio.h>
#define D 30
int main()
{
    int a[D][D];
    int n;
    int b,c,d;
    printf("Enter n: ");
    while (scanf_s("%d", &n) != 0)
    {
        for (b = 0; b < n; b++)
            for (c= 0; c < n; c++)
                if (b < c)
                {
                    a[b][c] = b + 1;
                }
                else
                {
                    a[b][c] = c + 1;
                }

        for (b = 0; b < n; b++)
        {
            for (c = 0; c< n; c++)
                printf("%d ", a[b][c]);
            printf("\n");
        }
        printf("\nEnter n: ");
    }

    return 0;
}

#include<stdio.h>
#define N 80
int main()
{
    char views1[N] = " hey, c, i hate u.";
    char views2[N] = " hey, c, i love u.";
    char a; 
    int b;
 
    printf("original views:\n");
    printf("views1:");

    puts(views1);
    printf("views2:");

    puts(views2);
    for (a = 0; views1[a] != '\0'; a++)
    {
        b = views1[a];
        views1[a] = views2[a];
        views2[a] = b;
    }
    printf("\nswapping...\n\n");
    printf("views1:");

    puts(views1);
    printf("views2:");

    puts(views2);
    return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#define N 5
#define M 20
void bubble_sort(char str[][M], int n);
int main()
{
    char name[][M] = { "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]);
    printf("\n排序中...\n");
    bubble_sort(name, N);
    printf("\n按字典序输出名单:\n");
    for (i = 0; i < N; i++)
        printf("%s\n", name[i]);
    return 0;
}
void bubble_sort(char str[][M], int n)
{
    int i, j, k;
    char a[10];
    for (i = 1; i < n * (n - 1) / 2; i++)
    {
    for (j = 0; j < N - 1; j++)
    {
     if (str[j][0] == str[j + 1][0])
     {
     for (k = 1; k < M; k++)
     {
     if (str[j][1] > str[j + 1][1])
      {
         strcpy(a, str[j + 1]);
         strcpy(str[j + 1], str[j]);
         strcpy(str[j], a);
      }
      }

      }
      else if (str[j][0] > str[j + 1][0])
        {
          strcpy(a, str[j + 1]);
          strcpy(str[j + 1], str[j]);
          strcpy(str[j], a);
         }
        }

    }


}