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;
}

task1_1

1、是；4个字节

2、是；1个字节

3、是；是

task1_2

1、是；4个内存字节

2、是；1个内存字节

 

#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 days[N] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
    int sum = 0;
    if (year % 4 == 0) {
        for (int i = 1; i < month; i++) {
            sum += days[i];
        }
        sum += day;
        sum++;
    }
    else {
        for (int i = 1; i < month; i++) {
            sum += days[i];
        }
        sum += day;
    }

    return sum;

}

#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)
{
    double aver;
    int sum = 0;
    for (int i = 0; i < n; i++)
    {
        sum += x[i];
    }
    aver = (double)sum / n;
    return aver;
}

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

}

 

#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 i = 0, j = 0;
    int a[16] = {0};
    while (x) {
        a[i] = x % n;
        x /= n;
        i++;
    }
    for (j = i - 1; j >= 0; j--) {
        if (a[j] >= 10) {
            printf("%c", 'A' + a[j] - 10);
        }
        else
            printf("%d", a[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  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 (j >= i) x[i][j] = i + 1;
            else 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);

    // 交换
    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]);

    // 交换
    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>
#include<stdlib.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;
    char t[M];
    for (i = 0; i < N - 1;i++) {
        for (j = 0; j < N - 1; j++) {
            if (strcmp(str[j], str[j + 1]) > 0) {
                strcpy_s(t, str[j]);
                strcpy_s(str[j], str[j + 1]);
                strcpy_s(str[j + 1], t);
            }
        }
    }
}