实验七

实验四
#include<stdio.h>
#include<ctype.h>
int main(){
    FILE *fp;
    fp=fopen("data4.txt","r");
    if(fp==NULL){
    printf("打不开,有问题 \n");
    return 1;
} 
    int line=0,cha=0,c;
    while((c=fgetc(fp))!=EOF){
        if(c=='\n')
        line++;
        if(c!=' ' &&c!='\t'&&c!='\n')
        cha++;
        }
        if(cha>0 &&(c!='\n'))
        line++;
        printf("date4.txt 统计结果: \n");
        printf("行数:\t%d\n",line);
        printf("字符数(不计空白符):\t%d\n",cha);
        fclose(fp);
        return 0;
    }

 实验五

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...\n", N);
    read(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);   // 输出所有考生完整信息到屏幕
    write(stu, N);    // 输出考试通过的考生信息到文件

    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;
    }

    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 write(STU s[], int n) {
    int i;
    FILE *fp;
    fp=fopen("list_pass.txt","w");
    if(fp==NULL){
        printf("有问题\n");
    }
    fprintf(fp,"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++){
    
    fprintf(fp,"%1d\t%s\t%.2f\t%.2f\t%.2f\t%s\n", s[i].id,
                                            s[i].name,
                                            s[i].objective,
                                            s[i].subjective,
                                            s[i].sum,
                                            s[i].result);
    }
    fclose(fp);
    }

// 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[]){
    int i,count;
    count=0; 
    for(i=0;i<n;i++){    
    st[i].sum=st[i].objective+st[i].subjective;
    if(st[i].sum>=60){    
    strcpy(st[i].result,"通过");
    st_pass[count]=st[i];
    count+=1;
}
    else
    strcpy(st[i].result,"不通过");
}
    return count;
    }

s实验六

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

#define STUDENT_COUNT 80
#define LINE_LENGTH 50

typedef struct {
    char id[15];
    char name[20];
    char classInfo[30];
} Student;

int main() {
    Student students[STUDENT_COUNT];
    int selected[STUDENT_COUNT] = {0};
    FILE *file;
    int i, j;
    char filename[50];  // 提前声明 filename 变量

    srand((unsigned int)time(NULL));

    file = fopen("list.txt", "r");
    if (file == NULL) {
        printf("无法打开 list.txt 文件!\n");
        return 1;
    }

    for (i = 0; i < STUDENT_COUNT; i++) {
        fscanf(file, "%s %s %s", students[i].id, students[i].name, students[i].classInfo);
    }
    fclose(file);

    printf("-------------中奖名单-------------\n");
    for (i = 0; i < 5; i++) {
        int lucky_index;
        do {
            lucky_index = rand() % STUDENT_COUNT;
        } while (selected[lucky_index] == 1);

        selected[lucky_index] = 1;
        printf("%-12s %-10s %s\n", students[lucky_index].id, students[lucky_index].name, students[lucky_index].classInfo);
    }

    printf("-------------保存到文件-------------\n");
    printf("输入文件名:");
    scanf("%s", filename);

    file = fopen(filename, "w");
    if (file == NULL) {
        printf("无法创建文件!\n");
        return 1;
    }

    for (i = 0; i < STUDENT_COUNT; i++) {
        if (selected[i] == 1) {
            fprintf(file, "%-12s %-10s %s\n", students[i].id, students[i].name, students[i].classInfo);
        }
    }
    fclose(file);

    printf("保存成功!\n");

    system("pause");
    return 0;
}

 

posted @ 2025-06-09 11:03  MA2C  阅读(13)  评论(0)    收藏  举报