实验七

task 4

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

const int N = 5, M = 100;

int main() {
    char ch[M];
    int n = 0;
       FILE *fp;
       
       fp = fopen("D:/Seven/data4.txt","r");
   
    while(! feof(fp)) {
        fscanf(fp,"%s",ch);
        n += strlen(ch);
    }
    
 
     printf("data4.txt中共包含的字符数(不计空白字符)：%d",n);
    
    fclose(fp);
       
       return 0;
}

 

task 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("D:/Seven/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 tmp;
    int i, j;
   
    for (i = 0; i < n; ++i) {
        s[i].sum =s[i].objective+s[i].subjective;
    }

    for (i = 0; i < n-1; ++i) {
        for (j = 0; j < n- i-1; ++j) {
            if (s[j].sum < s[j + 1].sum) {
                tmp = s[j];
                s[j] = s[j + 1];
                s[j + 1] = tmp;
            }
        }
    }
    for (i = 0; i < n; ++i) {
        if (i <= n * 0.1)
            strcpy(s[i].level, "优秀");
        else if (i > n * 0.1 && i <= n * 0.5)
            strcpy(s[i].level, "合格");
        else
            strcpy(s[i].level, "不合格");
    }
   
}

 

task 6

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80

typedef struct 
{
    long int id;
    char name[20];
    char _class[100];
}STU;

void input(STU s[], int n);
void output(STU a[], int n);
void process(STU s[], STU a[], int n);

int main()
{
    STU stu[N], a[5];

    input(stu, N);

    process(stu, a, N);

    output(a, 5);

    return 0;
}

void input(STU s[],int n)
{
    int i;
    FILE* fin;
    fin = fopen("D:/Seven/list.txt", "r");
    if(fin==NULL)
    {
        printf("fail to open file\n");
        exit(0);
    }
    while(!feof(fin))
    {
        for (i = 0; i < n; i = i + 1)
            fscanf(fin, "%ld %s %s", &s[i].id, &s[i].name, &s[i]._class);
    }
    fclose(fin);
}

void output(STU a[],int n)
{
    FILE* fout;
    int i;

    printf("\n");
    for (i = 0; i < n; i = i + 1)
        printf("%ld  %s  %s\n", a[i].id, a[i].name, a[i]._class);

    fout = fopen("lucky.txt", "w");
    if(!fout)
    {
        printf("fail to open or create lucky.txt\n");
        exit(0);
    }
    for (i = 0; i < n; i = i + 1)
        fprintf(fout, "%ld  %s  %s\n", a[i].id, a[i].name, a[i]._class);
    fclose(fout);
}

void process(STU s[],STU a[], int n)
{
    int b1, b2, b3, b4, b5;
    srand(time(0));
    b1 = rand() % 80 + 1;
    b2 = rand() % 80 + 1;
    b3 = rand() % 80 + 1;
    b4 = rand() % 80 + 1;
    b5 = rand() % 80 + 1;
    a[0] = s[b1];
    a[1] = s[b2];
    a[2] = s[b3];
    a[3] = s[b4];
    a[4] = s[b5];
}