实验7

task.4

#include<stdio.h>

int main(){
    FILE *fp;

    int k = 0;
    char ch;

    fp = fopen("data4.txt","r");

    if(fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }

    while(1){
    ch = fgetc(fp);

    if(ch == EOF)
    break;

    if(ch != ' '&&ch !='\n'&&ch != '\r')
    k++;

    }

    printf("data4.txt中共包含字符数:%d",k);

    fclose(fp);

    return 0;
}

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;          // 总分
    char ans[10];       // 考试结果
} STU;

// 函数声明
void finput(STU st[], int n);
void foutput(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);

int main() {
    STU stu[N], stu_pass[N];
    int cnt;
    double pass_rate;

    printf("从文件读入%d个考生信息...\n", N);
    finput(stu, N);

    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);

    printf("\n通过考试的名单:\n");
    output(stu, N);      // 输出到屏幕
    foutput(stu, N);    // 输出到文件

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

    return 0;
}

// 把通过考试的考生完整信息输出到屏幕上
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void output(STU st[], int n) {
    int i;

    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结果\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].ans);
}

// 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 finput(STU st[], 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", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
    }

    fclose(fin);
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void foutput(STU s[], int n) {
    FILE *fout;
    int i;

    // 保存到文件
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open or create list_pass.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结果\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].ans);

    fclose(fout);
}



// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
    // 待补足
    // ×××

    FILE *fp;
    int i, k = 0;

    fp = fopen("examinee.txt", "r");
    if (!fp) {
        printf("fail to open or create list_pass.txt\n");
        exit(0);
    }

    for(i = 0;i < n;i++){
        fscanf(fp,"%ld%s%f%f",&st[i].id,st[i].name,&st[i].objective,&st[i].subjective);
        st[i].sum = st[i].objective + st[i].subjective;

        if(st[i].sum >= 60){
            st_pass[k] = st[i];
            k++;
            strcpy(st[i].ans,"pass");
        }
        else
        strcpy(st[i].ans,"fail");
    }

    fclose(fp);

    return k;

}

6

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

typedef struct {
    int id;
    char name[20];
    char class[100];
}info;


void finput(info stu[], int n) {

    FILE* fp;
    fp = fopen("list.txt", "r");
    while (!feof(fp)) {
        for (int i = 0; i < N; i++) {
            fscanf(fp, "%d%s%s", &stu[i].id, stu[i].name, stu[i].class);
        }
    }
    fclose(fp);
}

void output(info stu[], int n) {
    for (int i = 0; i < n; i++)
        printf("%d\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].class);
}

void translate(info stu[], info sts[], int n) {
    srand((unsigned)time(NULL));
    int judge[80] = { 0 };
    for (int i = 0; i < 5; i++) {
        int j = rand() % 80 + 1;
        if (judge[j] == 1) {
            i--;
            continue;
        }
        sts[i].id = stu[j].id;
        strcpy(sts[i].name, stu[j].name);
        strcpy(sts[i].class, stu[j].class);
        judge[j] = 1;
    }
}

void sort(info sts[], int n) {
    for (int i = 0; i < 5; i++) {
        for (int j = i; j < 5; j++) {
            if (sts[i].id > sts[j].id) {
                int l = sts[i].id;
                sts[i].id = sts[j].id;
                sts[j].id = l;
                char p[100];
                strcpy(p, sts[i].name);
                strcpy(sts[i].name, sts[j].name);
                strcpy(sts[j].name, p);
            }
        }
    }
}

int main()
{
    info stu[N], sts[5];
    finput(stu, N);
    output(stu, N);
    printf("\n");
    translate(stu, sts, N);
    sort(sts, 5);
    output(sts, 5);

    return 0;
}