526互联

task.4

发布时间 2023-04-16 17:52:21作者: wwwtttt
#include <stdio.h>
#include<stdlib.h>
#define N 4

int main() {
    int a[N] = {2, 0, 2, 3};          
    char b[N] = {'2', '0', '2', '3'}; 
    int i;

    printf("sizeof(int) = %d\n", sizeof(int));
    printf("sizeof(char) = %d\n", sizeof(char));
    printf("\n");

    // 输出int型数组a中每个元素的地址、值 
    for (i = 0; i < N; ++i)
        printf("%p: %d\n", &a[i], a[i]);

    printf("\n");

    // 输出char型数组b中每个元素的地址、值 
    for (i = 0; i < N; ++i)
        printf("%p: %c\n", &b[i], b[i]);
    
    printf("\n");
    
    // 输出数组名a和b对应的值 
    printf("a = %p\n", a); 
    printf("b = %p\n", b); 
    system("pause");
    return 0;
}

1.2

#include <stdio.h>
#include<stdlib.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;

    // 输出int型二维数组a中每个元素的地址、值 
    for (i = 0; i < N; ++i)
        for (j = 0; j < M; ++j)
            printf("%p: %d\n", &a[i][j], a[i][j]);
    
    printf("\n");

    // 输出int型二维数组名a, 以及，a[0], a[1]的值
    printf("a = %p\n", a);
    printf("a[0] = %p\n", a[0]);
    printf("a[1] = %p\n", a[1]);
    printf("\n");


    // 输出char型二维数组b中每个元素的地址、值
    for (i = 0; i < N; ++i)
        for (j = 0; j < M; ++j)
            printf("%p: %c\n", &b[i][j], b[i][j]);
    printf("\n");

    // 输出char型二维数组名b, 以及，b[0], b[1]的值
    printf("b = %p\n", b);
    printf("b[0] = %p\n", b[0]);
    printf("b[1] = %p\n", b[1]);
    printf("\n");
    system("pause");
    return 0;
}

2

#include <stdio.h>
#include<stdlib.h>
#include <string.h>

#define N 80

void swap_str(char s1[N], char s2[N]);
void test1();
void test2();

int main() {
    printf("测试1: 用两个一维维数组，实现两个字符串交换\n");
    test1();

    printf("\n测试: 用二维数组，实现两个字符串交换\n");
    test2();
    system("pause");
    return 0;
}

void test1() {
    char views1[N] = "hey, C, I hate u.";
    char views2[N] = "hey, C, I love u.";

    printf("交换前: \n");
    puts(views1);
    puts(views2);

    swap_str(views1, views2);

    printf("交换后: \n");
    puts(views1);
    puts(views2);
}

void test2() {
    char views[2][N] = {"hey, C, I hate u.", "hey, C, I love u."};

    printf("交换前: \n");
    puts(views[0]);
    puts(views[1]);

    swap_str(views[0], views[1]);

    printf("交换后: \n");
    puts(views[0]);
    puts(views[1]);
}

void swap_str(char s1[N], char s2[N]) {
    char tmp[N];

    strcpy(tmp, s1);
    strcpy(s1, s2);
    strcpy(s2, tmp);
}

3.1

#include <stdio.h>

#define N 80

int count(char x[]);

int main() {
    char words[N+1];
    int n;

    while(gets(words) != NULL) {
        n = count(words);
        printf("单词数: %d\n\n", n);
    }

    return 0;
}

int count(char x[]) {
    int i;
    int word_flag = 0;  // 用作单词标志，一个新单词开始，值为1；单词结束，值为0
    int number = 0;  // 统计单词个数

    for(i = 0; x[i] != '\0'; i++) {
        if(x[i] == ' ')
            word_flag = 0;
        else if(word_flag == 0) {
            word_flag = 1;
            number++;
        }
    }

    return number;
}

3.2

#include <stdio.h>
#define N 1000

int main() {
    char line[N];
    int word_len;   // 记录当前单词长度
    int max_len;    // 记录最长单词长度
    int end;        // 记录最长单词结束位置
    int i;

    while(gets(line) != NULL) {
        word_len = 0;
        max_len = 0;
        end = 0;

        i = 0;
        while(1) {
            // 跳过连续空格
            while(line[i] == ' ') {
                word_len = 0;  // 单词长度置0，为新单词统计做准备
                i++;
            }

            // 在一个单词中，统计当前单词长度
            while(line[i] != '\0' && line[i] != ' ') {
                word_len++;
                i++;
            }
        
            // 更新更长单词长度，并，记录最长单词结束位置
            if(max_len < word_len) {
                max_len = word_len;
                end = i;   // end保存的是单词结束的下一个坐标位置
            }

            // 遍历到文本结束时，终止循环
            if(line[i] == '\0')
                break;
        }

        // 输出最长单词
        printf("最长单词: ");
        for(i = end - max_len; i < end; ++i)
            printf("%c", line[i]);
        printf("\n\n");
    }

    return 0;
}

 4

#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("%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 t=0;
    for (i = 0; i < n; ++i)
        t += x[i];
    return t/i;
}
void bubble_sort(int x[], int n)
{
    int t,p;
    double m;
    for (p = 0; p < n-1; p++)
    {
        for (t = 0; t < n-p-1; t++)
        {
            if (x[t] < x[t + 1])
            {
                m = x[t];
                x[t] = x[t + 1];
                x[t + 1] = m;
            }
        }
    }
}

5

#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("%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[N], b[N];
    int i,t,d,j;
    j = x;
    for (i = 0; j > 0; i++)
    {
        t = j % n;
        if (t < 10)
           a[i] = t + '0';
        else
            switch (t)
            {
            case 10: a[i] = 'A';
            case 11: a[i] = 'B';
            case 12: a[i] = 'C';
            case 13: a[i] = 'D';
            case 14: a[i] = 'E';
            case 15: a[i] = 'F';
            }
        j = j / n;
    }
    a[i] = '\0';
    for (d = 0; d < i; d++)
        b[d] = a[i - d - 1];
    b[d] = '\0';
    puts(b);
}

6

#include <stdio.h>
#define N 100
#define M 4

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


int main() {
    int t[][N] = {{21, 12, 13, 24},
                  {25, 16, 47, 38},
                  {29, 11, 32, 54},
                  {42, 21, 33, 10}};

    printf("原始矩阵:\n");
    output(t, M);
    rotate_to_right(t, M); 
    printf("变换后矩阵:\n");
    output(t, M);

    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("%4d", x[i][j]);

        printf("\n");
    }
}
void rotate_to_right(int x[][N], int n)
{
    int i,t;
    for (i = 0; i < 4; i++)
    {
        t = x[i][3];
        x[i][3] = x[i][2];
        x[i][2] = x[i][1];
        x[i][1] = x[i][0];
        x[i][0] = t;
    }
}

7.1

#include <stdio.h>
#define N 80

void replace(char x[], char old_char, char new_char); // 函数声明

int main() {
    char text[N] = "c programming is difficult or not, it is a question.";

    printf("原始文本: \n");
    printf("%s\n", text);

    replace(text, 'i', '*'); // 函数调用 注意字符形参写法，单引号不能少

    printf("处理后文本: \n");
    printf("%s\n", text);

    return 0;
}

// 函数定义
void replace(char x[], char old_char, char new_char) {
    int i;

    for (i = 0; x[i] != '\0'; ++i) // 思考: '\0'是什么，为什么能作为循环结束条件
        if (x[i] == old_char)
            x[i] = new_char;
}

7.2

#include <stdio.h>
#define N 80
int main() {
    char str[N], ch;
    int i;
    printf("输入字符串: ");
    gets(str);
    printf("输入一个字符: ");
    ch = getchar();
    printf("截断处理......");
    i = 0;
    while (str[i] != '\0') 
    {
        if (str[i] == ch)
            str[i] = '\0';
        i++;
    }
    str[i] = '\0';
    printf("\n截断处理后字符串: %s\n", str);
    return 0;
}

8

#include <stdio.h>
#include <string.h>

#define N 5
#define M 20

void bubble_sort(char str[][M], int n); // 函数声明

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);  // 函数调用 

    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 a, b, c;
    char tmp[M];
    for (a = 0; a < 4; a++)
    {
        for (b = 0; b < 20; b++)
        {
            if (str[a][b] > str[a + 1][b])
            {
                strcpy(tmp, str[a]);
                strcpy(str[a], str[a + 1]);
                strcpy(str[a + 1],tmp); 
                break;
            }
            else
                if (str[a][b] < str[a + 1][b])
                    break;
        }
    }
}