C语言问题解决实例1

1.问题1，截图如下：

代码运行截图：

解决对应代码如下：

#include 
#include 
 
#define MAX_LINE_LENGTH 100
struct Event {
    int age;
    int id;
    int year;
    int month;
    int day;
    char name[20];
};
int main() {
    FILE* file;
    char line[MAX_LINE_LENGTH];
    // Open the file
    file = fopen("A.txt", "r");
    if (file == NULL) {
        printf("Unable to open the file.\n");
        return 1;
    }
    printf("------------------------------------------\n");
    // Read and print each line until the end of the file
    while (fgets(line, sizeof(line), file)) {
        struct Event event;
        sscanf(line, "%d,%d,%d,%d,%d,%s[^\n]", &event.age, &event.id, &event.year, &event.month, &event.day, event.name);
        printf("%d岁以下,%s,%d,%d/%d/%d\n", event.age, event.name, event.id, event.year, event.month, event.day);
        printf("------------------------------------------\n");
    }
    // Close the file
    fclose(file);
    return 0;
}

2.问题2，截图如下：

代码运行及截图如下：

解决对应代码如下：

#include 
#include 
#include 
#define MAX_LINE_LENGTH 100
struct Event {
    int age;
    int id;
    int year;
    int month;
    int day;
    char name[20];
};
void findMatchingEvents(int age, int id) {
    FILE* file = fopen("A.txt", "r");
    if (file == NULL) {
        printf("无法打开文件\n");
        return;
    }
    char line[MAX_LINE_LENGTH];
    bool found = false;
    while (fgets(line, MAX_LINE_LENGTH, file)) {
        struct Event event;
        sscanf(line, "%d,%d,%d,%d,%d,%s[^\n]", &event.age, &event.id, &event.year, &event.month, &event.day, event.name);
        if (age <= event.age  && event.id == id) {
            printf("能参加的项目：%s\n", event.name);
            found = true;
            break;
        }
    }
    fclose(file);
    if (!found) {
        printf("没有找到符合条件的项目\n");
    }
}
int main() {
    int age, id;
    printf("请输入年龄：");
    scanf("%d", &age);
    printf("请输入工号：");
    scanf("%d", &id);
    findMatchingEvents(age, id);
    return 0;
}

3.问题3，截图如下：

代码运行对应截图如下：

解决对应代码如下：

#include 
#include 
#include 
#define MAX_LINE_LENGTH 100
struct Event {
    int age;
    int id;
    int year;
    int month;
    int day;
    char name[20];
};
//查找1
void findMatchingEvents(int age, int id) {
    FILE* file = fopen("A.txt", "r");
    if (file == NULL) {
        printf("无法打开文件\n");
        return;
    }
    char line[MAX_LINE_LENGTH];
    bool found = false;
    int iLine = 1;
    while (fgets(line, MAX_LINE_LENGTH, file)) {
        struct Event event;
        sscanf(line, "%d,%d,%d,%d,%d,%s[^\n]", &event.age, &event.id, &event.year, &event.month, &event.day, event.name);
        if (age <= event.age  && event.id == id) {
            printf("能参加的项目：%s,编号：%d\n", event.name, iLine);
            found = true;
            break;
        }
        iLine++;
    }
    fclose(file);
    if (!found) {
        printf("没有找到符合条件的项目\n");
    }
}
//保存字符串到文件中
void savecontent(char* str) {
    FILE* file = fopen("B.txt", "w");
    if (file == NULL) {
        printf("无法打开文件\n");
        return ;
    }
    fputs(str, file);
    fclose(file);
}
//查找2
void findMatchingEvents2(int nameid) {
    FILE* file = fopen("A.txt", "r");
    if (file == NULL) {
        printf("无法打开文件\n");
        return;
    }
    char line[MAX_LINE_LENGTH], line2[MAX_LINE_LENGTH];
    bool found = false;
    int iLine = 1;
    while (fgets(line, MAX_LINE_LENGTH, file)) {
        if (nameid == iLine) {
            struct Event event;
            sscanf(line, "%d,%d,%d,%d,%d,%s[^\n]", &event.age, &event.id, &event.year, &event.month, &event.day, event.name);
            sprintf(line2,"教师工号：%d,项目编号：%d，项目比赛时间：%d/%d/%d\n", event.id, nameid, event.year, event.month, event.day);
            printf("%s", line2);//屏幕输出
            savecontent(line2);//将line2内容写入文本文件B.txt中
            found = true;
            break;
        }
        else
        {
            iLine++;
        }
        
        
    }
    fclose(file);
    if (!found) {
        printf("没有找到符合条件的项目\n");
    }
}
int main() {
    int age, id,nameid;
    printf("请输入年龄：");
    scanf("%d", &age);
    printf("请输入工号：");
    scanf("%d", &id);
    findMatchingEvents(age, id);
    printf("请输入项目编号：");
    scanf("%d", &nameid);
    findMatchingEvents2(nameid);
    return 0;
}

解析：

这上面三个问题，主要是用到的功能有：文件的读写，结构体，循环，字符串键盘输入读取，屏幕输出，字符串查找判断，字符串赋值等操作。这是基本操作，主要是考查学生的基本功。如有不足之处，欢迎大家来讨论指正。