实验5

task1.1

#include<stdio.h>
#define N 5

void input(int x[],int n);
void output(int x[],int n);
void find_min_max(int x[], int n, int *pmin, int *pmax);

int main()
{
    int a[N];
    int min ,max;
    printf("录入%d个数据：\n",N);
    input(a,N);

    printf("数据是:\n");
    output(a,N);

    printf("数据处理...\n");
    find_min_max(a,N,&min,&max);

    printf("输出结果:\n");
    printf("min = %d,max = %d\n",min,max);
    
    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");
}

void find_min_max(int x[],int n, int *pmin, int *pmax){
    int i;
    *pmin = *pmax = x[0];
    for(i=0;i<n;++i)
        if(x[i]<*pmin)
            *pmin = x[i];
        else if(x[i]>*pmax)
            *pmax = x[i];
}

task1.2

#include<stdio.h>
#define N 5

void input(int x[],int n);
void output(int x[],int n);
int *find_max(int x[], int n);

int main()
{
    int a[N];
    int *pmax;
    printf("录入%d个数据：\n",N);
    input(a,N);

    printf("数据是:\n");
    output(a,N);

    printf("数据处理...\n");
    find_max(a,N);

    printf("输出结果:\n");
    printf("max = %d\n",*pmax);
    
    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");
}

int *find_max(int x[],int n){
    int max_index = 0;
    int i;
    
    for(i=1;i<n;++i){
        if(x[i]>x[max_index])
         max_index = i;
    }
    return &x[max_index];
}

task2.1

#include<stdio.h>
#include<string.h>
#define N 80

int main()
{
    char s1[] = "Learning makes me happy";
    char s2[] = "Learning makes me sleepy";
    char tmp[N];
    
    printf("sizeof(s1)vs. strlen(s1):\n");
    printf("sizeof(s1) = %d\n",sizeof(s1));
    printf("strlen(s1) = %d\n",strlen(s1));
    
    printf("\nbefore swap:\n");
    printf("s1:%s\n",s1);
    printf("s2:%s\n",s2);
    
    printf("\nswapping...\n");
    strcpy(tmp,s1);
    strcpy(s1,s2);
    strcpy(s2,tmp);
    
    printf("\nafter swap:\n");
    printf("s1:%s\n",s1);
    printf("s2:%s\n",s2);
    return 0;
}

task 2.2

#include<stdio.h>
#include<string.h>
#define N 80

int main()
{
    char *s1 = "Learning makes me happy";
    char *s2 = "Learning makes me sleepy";
    char *tmp;
    
    printf("sizeof(s1)vs. strlen(s1):\n");
    printf("sizeof(s1) = %d\n",sizeof(s1));
    printf("strlen(s1) = %d\n",strlen(s1));
    
    printf("\nbefore swap:\n");
    printf("s1:%s\n",s1);
    printf("s2:%s\n",s2);
    
    printf("\nswapping...\n");
    tmp = s1;
    s1 = s2;
    s2 = tmp;
    
    printf("\nafter swap:\n");
    printf("s1:%s\n",s1);
    printf("s2:%s\n",s2);
    return 0;
}

task 3

#include<stdio.h>



int main()
{
    int x[2][4] = {{1,9,8,4},{2,0,4,9}};
    int i,j;
    int *ptr1;
    int (*ptr2)[4];
    
    printf("输出1：使用数组名、下标直接访问二维数组元素\n");
    for(i=0;i<2;++i){
        for(j=0;j<4;++j)
        printf("%d",x[i][j]);
        printf("\n");
    }
    printf("\n输出2：使用指向元素的指针向量p间接访问二维数组元素\n");
    for(ptr1 = &x[0][0],i = 0;ptr1<&x[0][0]+8;++ptr1,++i){
        printf("%d",*ptr1);
        
        if((i + 1)%4 == 0)
         printf("\n");
    }
    
    printf("\n输出3：使用指向一位数组的指针向量q间接访问二维数组元素\n");
    for(ptr2 = x;ptr2<x+2;++ptr2){
        for(j = 0;j<4;++j)
        printf("%d",*(*ptr2+j));
        printf("\n");
    }
    return 0;
}

task 4.1

#include<stdio.h>
#define N 80

void replace(char *str, char old_char, char new_char);

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','*');
    
    printf("处理后文本：\n");
    printf("%s\n",text);
    
    return 0;
}

void replace(char *str, char old_char, char new_char){
    int i;
    while(*str){
        if(*str==old_char)
          *str = new_char;
        str++;
    }
}

task4.2

#include<stdio.h>
#define N 80

void str_trunc(char *str, char x);

int main()
{
    char str[N];
    char ch;
    
    printf("输入字符：");
    gets(str);
    
    printf("输入一个字符：");
    ch = getchar();
    
    printf("截断处理...\n");
    str_trunc(str,ch);
    
    printf("截断处理后的字符串：%s\n",str);
    
    return 0;
}

void str_trunc(char *str, char x){
    while(*str){
        if(*str==x)
        *str = '\0';
        *str++;
    }
    
}

task 5.1

#include<stdio.h>
#include<string.h>
void sort(char*name[], int n);

int main()
{
    char *course[4] = {"C Program",
                       "C++ Object Oriented Program",
                       "Operating System",
                       "Data Structure and Algorithms"};
    int i;
    
    sort(course,4);
    
    for(i = 0;i<4;++i)
    printf("%s\n",course[i]);
    
    return 0;
}

void sort(char *name[], int n){
    int i,j;
    char *tmp;
    
    for(i = 0;i<n;++i)
      for(j = 0;j<n-1-i;++j)
        if(strcmp(name[j],name[j+1])>0){
            tmp = name[j];
            name[j] = name[j+1];
            name[j+1] = tmp;
        }
}

task 5.2

#include<stdio.h>
#include<string.h>
void sort(char*name[], int n);

int main()
{
    char *course[4] = {"C Program",
                       "C++ Object Oriented Program",
                       "Operating System",
                       "Data Structure and Algorithms"};
    int i;
    
    sort(course,4);
    
    for(i = 0;i<4;++i)
    printf("%s\n",course[i]);
    
    return 0;
}

void sort(char *name[], int n){
    int i,j,k;
    char *tmp;
    
    for(i = 0;i<n-1;++i){
        k = i;
      for(j = i+1;j<n;++j)
        if(strcmp(name[j],name[k])<0)
           k = j;
                
        if(k!=i)
        {
            tmp = name[i];
            name[i] = name[k];
            name[k] = tmp;
        }
    }
}

task 6

#include<stdio.h>
#include<string.h>
#define N 5

int check_id(char *str);

int main()
{
    char *pid[N] = {"31010120000721656X",
                    "330106199609203301",
                    "53010220051126571",
                    "510104199211197977",
                    "53010220051126133Y"};
    int i;
    
    for(i = 0;i<N;++i)
     if(check_id(pid[i]))
       printf("%s\tTrue\n",pid[i]);
     else
       printf("%s\tFalse\n",pid[i]);
    return 0;
}

int check_id(char *str){

 int i;
    if(strlen(str)!=18){
        return 0;
    }
    for(i=0;i<17;++i){
        if(str[i]<'0'||str[i]>'9'){
             return 0;
        }
    }
    if(str[17]<'0'||(str[17]>'9'&&str[17]<'X')||str[17]>'X'){
        return 0;
   }

1 #include <stdio.h>
 2 #define N 80
 3 void encoder(char *str); // 函数声明
 4 void decoder(char *str); // 函数声明
 5 
 6 int main() {
 7     char words[N];
 8 
 9     printf("输入英文文本: ");
10     gets(words);
11 
12     printf("编码后的英文文本: ");
13     encoder(words); // 函数调用
14     printf("%s\n", words);
15 
16     printf("对编码后的英文文本解码: ");
17     decoder(words); // 函数调用
18     printf("%s\n", words);
19 
20     return 0;
21 }
22 
23 /*函数定义
24 功能：对s指向的字符串进行编码处理
25 编码规则：
26 对于a~z或A~Z之间的字母字符，用其后的字符替换; 其中，z用a替换，Z用A替换
27 其它非字母字符，保持不变
28 */
29 void encoder(char *str) {
30     int i=0;
31     while(str[i]!='\0'){
32         if(str[i]>='a'&&str[i]<'z'||str[i]>='A'&&str[i]<'Z'){
33             str[i]++;
34         }
35         else if(str[i]=='z'||str[i]=='Z'){
36             str[i]-=25;        
37         }
38         ++i;
39     }
40 }
41 
42 /*函数定义
43 功能：对s指向的字符串进行解码处理
44 解码规则：
45 对于a~z或A~Z之间的字母字符，用其前面的字符替换; 其中，a用z替换，A用Z替换
46 其它非字母字符，保持不变
47 */
48 void decoder(char *str) {
49     int i=0;
50     while(str[i]!='\0'){
51         if(str[i]>'a'&&str[i]<='z'||str[i]>'A'&&str[i]<='Z'){
52             str[i]--;
53         }
54         else if(str[i]=='a'||str[i]=='z'){
55             str[i]+=25;        
56         }
57         ++i;
58     }
59 }

posted @ 2023-11-27 17:29 Gustave-Ehsy 阅读(13) 评论(0) 收藏举报

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实验5

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