实验4

#include<stdio.h>
#include<stdlib.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("sozeof(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 i;
    int s = 0;
    int a[N] = { 0,31,0,31,30,31,30,31,31,30,31,30,31 };
    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
        a[2] = 29;
    else
        a[2] = 28;
    for (i = 1; i < month; i++)
        s+= a[i];
    s = s + day;
    return s;
}

#include<stdio.h>
#include<stdlib.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;
    double s = 0;
    double ave;
    for (i = 0; i < n; ++i)
        s += x[i];
    ave = s / n;
    return ave;
}
void bubble_sort(int x[], int n) {
    int i,j,t;
    for(j=0;j<n-1;++j)
        for(i=0;i<n-j-1;++i)
            if (x[i] < x[i + 1]) {
                t = x[i];
                x[i] = x[i + 1];
                x[i + 1] = t;
            }
    for(i=0;i<n;++i)
        printf("%d ", x[i]);
}

#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)
{
    char a[16] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','F' };
    char b[N];
    int  i, t, j;
    for (i = 0; x / n; i++)
    {
        t = x % n;
        b[i] = a[t];
        x = x / n;
    }
    b[i] = a[x];
    for (j = i; j >= 0; j--)
    {
        printf("%c", b[j]);

    }

    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, k;
    for (i = 0; i < n; i++)
    {
        for (j = 0; j <= i; j++)


            x[i][j] = i + 1;

        for (k = j; k < n; k++)
            x[i][k] = j;

    }
}

#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>
#pragma warning(disable:4996)
#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;
    char t[M];
    for (i = 0; i < n - 1; i++)
        for (j = 0; j < n - i - 1; j++) {
            if (strcmp(str[j], str[j + 1]) > 0)
            {
                strcpy(t, str[j]);
                strcpy(str[j], str[j + 1]);
                strcpy(str[j + 1], t);
            }
        }
}