实验六

实验任务4：

#include <stdio.h>

int main()
{
    FILE *fp;
    fp = fopen("data4.txt","r");
    
    char ch;
    int count = 0;
    do
    {
        ch = fgetc(fp);
        if(ch >= 33 && ch <= 126) count++;
    }while(ch != EOF);
    
    fclose(fp);
    
    printf("data4.txt中共包含字符数（不计空白符）：%d\n",count);
    
    return 0;
}

实验任务5：

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

#define N 10

typedef struct {
    long int id;
    char name[20];
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;
    char level[10];
} STU;

// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);

int main() {
    STU stu[N];

    printf("从文件读入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<=60)\n", N);
    input(stu, N);

    printf("\n对考生信息进行处理: 计算总分，确定等级\n");
    process(stu, N);

    printf("\n打印考生完整信息, 并保存到文件中");
    output(stu, N);

    return 0;
}

// 从文本文件examinee.txt读入考生信息:准考证号，姓名，客观题得分，操作题得分
void input(STU s[], int n) {
    int i;
    FILE *fin;

    fin = fopen("examinee.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }

    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective);
    }

    fclose(fin);
}

// 输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
// 不仅输出到屏幕上，还写到文本文件result.txt中
void output(STU s[], int n) {
    FILE *fout;
    int i;
    
    // 输出到屏幕
    printf("\n");
    printf("准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);
    
    // 保存到文件 
    fout = fopen("result.txt", "w");
    if (!fout) {
        printf("fail to open or create result.txt\n");
        exit(0);
    }
    
    fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n");

    for (i = 0; i < n; i++)
        fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);

    fclose(fout);
}

// 对考生信息进行处理：计算总分，排序，确定等级
void process(STU s[], int n) {
    STU t;
    for(int i = 0;i < n;i++)
        s[i].sum = s[i].objective + s[i].subjective;
        
    int stop = 1;
    while(stop)
    {
        stop = 0;
        for(int i = 0;i < n-1;i++)
        {
            if(s[i].sum < s[i+1].sum)
            {
                t = s[i];
                s[i] = s[i+1];
                s[i+1] = t;            
                stop = 1;
            }
        }
    }
    
    int good = n * 0.1 , pass = n * 0.5;
    for(int i = 0;i < n;i++)
        if(i+1 <= good) strcpy(s[i].level,"优秀");
        else if(i+1 >= good && i+1 <= pass) strcpy(s[i].level,"合格");
        else strcpy(s[i].level,"不合格"); 

}

实验任务6：

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

typedef struct
{
    long int no;
    char name[20];
    char cla[100];
}stu;

int main()
{
    FILE *fp1;
    fp1 = fopen("list.txt","r");
    
    stu a[80];
    int i = 0;
    while(!feof(fp1))
    {
        fscanf(fp1,"%ld %s %s",&a[i].no,a[i].name,a[i].cla);
        i++;
    }
    fclose(fp1);
    
    time_t T;
    T = time(NULL);
    struct tm *tmTime;
    tmTime = localtime(&T);
    char* format = "%Y%m%d";
    char strTime[100];
    strftime(strTime, sizeof(strTime), format, tmTime);
    strcat(strTime,".txt");
    
    FILE *fp2;
    fp2 = fopen(strTime,"w");
    srand((unsigned int)time(0));
    int count,b[5],repeat = 0; 
    for(int i = 0;i < 5;i++)
    {
        count = rand() % 80;
        
        for(int k = 0;k < i;k++)
            if(b[k] == count) repeat = 1;
        if(repeat) continue;    
        
        b[i] = count;
        fprintf(fp2,"%ld %s %s\n",a[count].no,a[count].name,a[count].cla);
        printf("%ld %s %s\n",a[count].no,a[count].name,a[count].cla);
        
    }
    fclose(fp2);
    
    return 0;
}