Experiment4

#include <stdio.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));

#include <stdio.h>
#define N 5

// 函数声明 
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;
}

// 函数定义
// 输入n个整数保存到整型数组x中 
void input(int x[], int n) {
    int i;
    
    for(i = 0; i < n; ++i)
        scanf("%d", &x[i]); 
}

// 输出整型数组x中n个元素 
void output(int x[], int n) {
    int i;
    
    for(i = 0; i < n; ++i)
        printf("%d ", x[i]);
    printf("\n");
}

// 计算整型数组x中n个元素均值，并返回 
// 补足函数average()实现
double average(int x[],int n){
    int i;
    double s=0,a;
    
    for(i=0;i<n;i++)
       s = s+x[i];
    a = s/n;

#include <stdio.h>
#define N 100
void dec2n(int x, int n); // 函数声明
int main() {
int x;
printf("输入一个十进制整数: ");
while(scanf("%d", &x) != EOF) {
dec2n(x, 2); // 函数调用: 把x转换成二进制输出
dec2n(x, 8); // 函数调用: 把x转换成八进制输出
dec2n(x, 16); // 函数调用: 把x转换成十六进制输出
printf("\n输入一个十进制整数: ");
}
return 0;
}
void dec2n(int x, int n){
    char s[N]="0123456789ABCDEF";
    int a[N],j,i=0;
    char q[N];
    while(x!=0){

#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);

    system("pause");
    return 0;
}
void output(int x[][N],int n){
    int i,j;

#include<stdio.h>
#include<stdlib.h>
#define N 80
void replace(char x[],char old_char,char new_char);
int main(){
    char text[N]="c programming is difficult or not,it is a question.";

#include<stdio.h>
#define N 80

int main(){
    char str[N],ch;
    int i;

    printf("输入字符串：");
    gets(str);

#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=0;
    char tmp[M];
    for (i=1;i<n;i++){
        for (j=n-1;j>=i;j--){
            k=0;
            if(str[j][k]==str[j-1][k]){
            while( str[j][k]==str[j-1][k] && str[j][k]!='\0' && str[j-1][k]!='\0'){
            k++;}
            }
            if (str[j][k]<str[j-1][k] || str[j][k]=='\0'){
            
            strcpy(tmp, str[j]);
            strcpy(str[j], str[j-1]);
            strcpy(str[j-1], tmp);
            }
            
        }
    }
}

 

    printf("输入一个字符：");
        ch = getchar();

    printf("截断处理：。。。。");
    i=0;
    while(str[i]!='\0'){
        if(str[i]==ch)
            break;
        i++;
    }
    str[i]='\0';
    printf("\n截断处理后字符：%s",str);
    
    return 0;
}

 

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

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

    system("pause");
    return 0;
}
void replace(char x[],char old_char,char new_char){
    int i;
    for(i=0;x[i]!='\0';++i)
        if (x[i]==old_char)
            x[i]=new_char;
}

 

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

 

        a[i]=x%n;
        x=x/n;
        i++;
    }
    i--;
    j=0;
    while (i>=0){
        q[j]=s[a[i]];
        j++;
        i--;
    }
    q[j]='\0';
    printf("%s\n",q);
}

 

return a; 
} 
 



// 对整型数组x中的n个元素降序排序 
// 补足函数bubble_sort()实现
void bubble_sort(int x[],int n){
    int i,j,t;
    for(i = 0;i<n;i++){
        for(j=0;j<n;j++){
          if(x[i]<x[i+1]){
             t = x[i];
             x[i] = x[i+1];
             x[i+1] = t;
        }
    }
}
}

 

    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);
    
    return 0;
}

#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;
    
    // 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");
    
    return 0;
}

#include <stdio.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();
    
    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);
}

#include <stdio.h>

#define N 80

int count(char x[]);

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

#include<stdio.h>
#include<stdlib.h>
#define N 1000

int main(){
    char line[N];
    int word_len;
    int max_len;
    int end;
    int i;

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

        i=0;
        while(1){
            while(line[i]==' '){
                word_len=0;
                i++;
            }
            while(line[i]!='\0'&&line[i]!=' '){
                word_len++;
                i++;
            }
            if(max_len<word_len){
                max_len=word_len;
                end=i;
            }
            if(line[i]=='\0')
                break;
        }
        printf("最长单词:");
        for(i=end-max_len;i<end;++i)
            printf("%c",line[i]);
        printf("\n\n");
    }
    system("pause");
    return 0;
}

 

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;
}