实验七

任务四

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#include <stdio.h>
#include <stdlib.h>  // system()所需头文件

int main() {
    FILE *fp;
    char ch;
    int line_count = 0;
    int char_count = 0;

    if ((fp = fopen("data4.txt", "r")) == NULL) {
        printf("文件打开失败!请检查data4.txt是否和程序放在同一文件夹\n");
        system("pause");
        return 1;
    }

    while ((ch = fgetc(fp)) != EOF) {
        if (ch == '\n') {
            line_count++;
        }
        else if (ch != ' ' && ch != '\t') {
            char_count++;
        }
    }

    fclose(fp);

    printf("data4.txt统计结果:\n");
    printf("行数:%18d\n", line_count);
    printf("字符数(不计空白符):%8d\n", char_count);

    system("pause");
    return 0;
}

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任务五

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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>

#define N 10

typedef struct {
    long id;            // 准考证号
    char name[20];      // 姓名
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char result[10];    // 考试结果
} STU;

// 函数声明
void read(STU st[], int n);
void write(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: 已完成\n", N);
    read(stu, N);

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

    printf("\n所有考生完整信息:\n");
    output(stu, N);

    printf("\n通过考试的名单写入文件: 已完成!\n");
    write(stu_pass, cnt);

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

    return 0;
}

// 把所有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].result);
}

// 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 read(STU st[], int n) {
    int i;
    FILE* fin;

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

    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);
}


int process(STU st[], int n, STU st_pass[]) {
    int j = 0;
    for (int i = 0; i < n; ++i)
        st[i].sum = st[i].objective + st[i].subjective;
    for (int i = 0; i < n; ++i) {
        if (st[i].sum >= 60) {
            strcpy(st[i].result, "通过");
            st_pass[j++] = st[i];
        }
        else
            strcpy(st[i].result, "不通过");
    }
    return j;
}

void write(STU st[], int n) {
    FILE* fp;
    fp = fopen("list_pass.txt", "w");
    if (!fp) {
        printf("fail to open");
        return;
    }
    fprintf(fp, "%-20s%-20s%-20s%-20s%-20s%s\n", "准考证号", "姓名", "客观题得分", "操作题得分", "总分", "结果");
    for (int i = 0; i < n; ++i)
        fprintf(fp, "%-20ld%-20s%-20g%-20g%-20g%-20s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
    fclose(fp);
}

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任务六、

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80
#define M 5
typedef struct{
    long id;
    char name[10];
    char cls[20];
} STU;
int main()
{
    STU all[N];
    STU lucky[M];
    FILE *fin,*fp;
    char  outfilename[N];
    int i,j,k=0,randIdx;
    int flag[N]={0};
    fin=fopen("D:\\C练习\\实验课\\实验7\\实验7数据文件及部分代码_gbk\\list.txt","r");
    if(!fin){
        printf("fail to open file\n");
        return 0;
    }
    while(fscanf(fin,"%ld%s%s",&all[k].id,all[k].name,all[k].cls)!=EOF)
    {
        k++;
    }
    fclose(fin);
    srand((unsigned)time(NULL));
    for(i=0;i<5;++i)
    {
        do{
            randIdx=rand()%80;
        }while(flag[randIdx]==1);
        flag[randIdx]=1;
        lucky[i]=all[randIdx];
    }
    printf("------------中奖名单------------\n");
    for(i=0;i<5;++i)
    {
        printf("%ld\t%s\t%s\n",lucky[i].id,lucky[i].name,lucky[i].cls);
    }
    printf("------------保存到文件-----------\n");
    printf("输入文件名:");
    scanf("%s",outfilename);
    fp=fopen(outfilename,"w");
    if(!fp)
    {
        printf("fail to open file\n");
        return 0;
    }
    for(i=0;i<5;++i)
    {
        fprintf(fp,"%ld\t%s\t%s\n",lucky[i].id,lucky[i].name,lucky[i].cls);
    }
    fclose(fp);
    printf("文件保存成功!");
    return 0;
}

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posted @ 2026-06-23 19:58  尽繁华  阅读(8)  评论(0)    收藏  举报