实验四

#include<stdio.h>
#define N 4
int main()
{
    int a[N] = { 1,9,8,4 };
    char b[N] = { '1','9','8','4' };
    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;
}

#include <stdio.h>
#define N 2
#define M 4
int main() {
    int a[N][M] = { {1, 9, 8, 4}, {2, 0, 2, 2} };
    char b[N][M] = { {'1', '9', '8', '4'}, {'2', '0', '2', '2'} };
    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;
}

#include <stdio.h>
#define N 13
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) != EOF) {
        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 n;
    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
    {
        n = 1;
    }
    else
        n = 0;
    int i,s,ans=day;
    s = 28 + n;
    int x[N] = { 0,31 ,s,31,30,31,30,31, 31,30,31,30,31 };
    for (i = 0; i < month; i++) {
        ans = ans + x[i];
    }
    return ans;
}

 

#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 bubble_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);
    bubble_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, s=0,ans;
    for (i = 0; i < n; ++i) {
        s += x[i];
    }
    ans = s / n;
    return ans;

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

    }
}

#include <stdio.h>
#define N 100
void dec2n(int x, int n); 
int main()
{
    int x;
    printf("输入一个十进制整数: ");
    while (scanf_s("%d", &x) != EOF)
    {
        dec2n(x, 2);
        dec2n(x, 8);
        dec2n(x, 16);
        printf("\n输入一个十进制整数: ");
    }
    return 0;
}
void dec2n(int x, int n) 
{
    int ans=0,i,j=0,m,b=1;
    if (n == 2) 
    {
        while (x != 0) {
            m = x % 2;
            x = x / 2;
            ans = ans + m * b;
            b = b * 10;
            j++;
        }
        printf("%d", ans);
        printf("\n");
    }
    if (n == 8) 
    {
        while (x != 0) {
            m = x % 8;
            x = x / 8;
            ans = ans + m * b;
            b = b * 10;
            j++;
        }
        printf("%d", ans);
        printf("\n");
    }
    int t[100];
    if (n == 16)
    {
        int j = 0;
        char y[100];
        char temp[17] = { "0123456789ABCDEF"};
        while (x != 0)
        {
            m = x % 16;
            t[j++] = m;
            x = x / 16;
        }
        i = j;
        for (--i; i >=0; i--) {
            printf("%c",temp[t[i]]);
        }
        printf("\n");

    }
}

#include <stdio.h>
#define N 100
void func(int x[][N], int n);
void output(int x[][N], int n); 
int main() {
    int x[N][N];
    int i, j, n;
    printf("Enter n: ");
    while (scanf_s("%d", &n) != EOF) {
        func(x, n); 
        output(x, n);

        printf("\nEnter n: ");
    }
    return 0;
}
void output(int x[][N], int n) {
    int i, j;
    for (i = 0; i < n; ++i) {
        for (j = 0; j < n; ++j)
            printf("%5d", x[i][j]);

        printf("\n");

    }
}
void func(int x[][N], int n) {
    int i, j;
    for (i = 0; i <=n; ++i) {
        for (j = 0; j < n; ++j) {
            if (i <= j) {
                x[i][j] = i + 1;
            }
            else if (i > j) {
                x[i][j] = j + 1;
            }
        }

    }

    }

#include <stdio.h>
#include <string.h>
#define N 80
int main() {
    char views1[N] = "hey, C, I have not love u yet.";
    char views2[N] = "hey, C, how can I love u?";
    char t[N];
    printf("交换前: \n");
    printf("views1: %s\n", views1);
    printf("views2: %s\n", views2);
    strcpy_s(t, views1);
    strcpy_s(views1, views2);
    strcpy_s(views2, t);
    printf("交换后: \n");
    printf("views1: %s\n", views1);
    printf("views2: %s\n", views2);
    return 0;
}

#include <stdio.h>
#include <string.h>
#define N 80
int main() {
    char views[2][N] = { "hey, C, I have not love u yet.","hey, C, how can I love u?" };
    char t[N];
    printf("交换前: \n");
    printf("views1: %s\n", views[0]);
    printf("views2: %s\n", views[1]);
    strcpy_s(t, views[0]);
    strcpy_s(views[0], views[1]);
    strcpy_s(views[1], t);
    printf("交换后: \n");
    printf("views1: %s\n", views[0]);
    printf("views2: %s\n", views[1]);
    return 0;
}

#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) {
    char x[M];
    int i,j;
    for (i = 0; i < n-1; i++) {
        for(j=0;j<n-i-1;j++)
        if (strcmp(str[j], str[j+ 1]) >0) {
            strcpy_s(x, str[j]);
            strcpy_s(str[j], str[j + 1]);
            strcpy_s(str[j + 1], x); 
            
            
        }
    }

}