实验7

实验4

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#include <stdio.h>

int main()
{
    FILE *fp;
    char ch;
    int line_cnt = 0;
    int char_cnt = 0;

    if ((fp = fopen("C:\\Users\\A1858\\Desktop\\data4.txt", "r")) == NULL)
    {
        perror("打开文件失败");
        return 1;
    }

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

    fclose(fp);

    printf("文件总行数：%d\n", line_cnt);
    printf("有效字符数（不含空格、回车、Tab）：%d\n", char_cnt);

    return 0;
}

实验任务5

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

#define N 10

typedef struct {
    long id;
    char name[20];
    float objective;
    float subjective;
    float sum;
    char result[10];
} STU;

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;
}

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%s\n", st[i].id, st[i].name,
        st[i].objective, st[i].subjective, st[i].sum, st[i].result);
}

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 i, pass_cnt = 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[pass_cnt++] = st[i];
        }
        else
        {
            strcpy(st[i].result, "不通过");
        }
    }
    return pass_cnt;
}

void write(STU st[], int n) {
    int i;
    FILE *fout;
    fout = fopen("list_pass.txt", "w");
    if (!fout)
    {
        printf("文件打开失败\n");
        return;
    }
    fprintf(fout, "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(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t%s\n",
        st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
    }
    fclose(fout);
}

实验6

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

#define MAX_STU 80
#define NAME_LEN 50

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

int main()
{
    FILE *fp;
    Student stus[MAX_STU];
    Student win[5];
    int flag[MAX_STU]={0};
    int total=0,i,j,randIdx,winCnt=0;
    char outFile[50];

    if((fp=fopen("list.txt","r"))==NULL)
    {
        perror("打开名单失败");
        return 1;
    }
    while(fscanf(fp,"%s%s%s",stus[total].id,stus[total].name,stus[total].cls)==3)
    {
        total++;
    }
    fclose(fp);

    srand((unsigned)time(NULL));
    while(winCnt<5)
    {
        randIdx=rand()%total;
        if(flag[randIdx]==0)
        {
            flag[randIdx]=1;
            win[winCnt]=stus[randIdx];
            winCnt++;
        }
    }

    printf("----------中奖名单----------\n");
    for(i=0;i<5;i++)
    {
        printf("%s %s %s\n",win[i].id,win[i].name,win[i].cls);
    }

    printf("输入文件名：");
    scanf("%s",outFile);
    if((fp=fopen(outFile,"w"))==NULL)
    {
        perror("写入文件失败");
        return 1;
    }
    for(i=0;i<5;i++)
    {
        fprintf(fp,"%s %s %s\n",win[i].id,win[i].name,win[i].cls);
    }
    fclose(fp);
    printf("保存成功！\n");
    return 0;
}