实验7

任务4

源代码：

#define  _CRT_SECURE_NO_WARINGS
#include <stdio.h>
#include <stdlib.h>

int main(){
    FILE *fp;
    char ch;
    int line=0, count=0;

    fp=fopen("D:\\data4.txt", "r");
    if(fp == NULL){
        printf("fail to open file to read\n");
        return 1;
    }

    while((ch=fgetc(fp)) != EOF){
        if (ch == '\n')
            line++;

        if(ch != ' ' && ch != '\n' && ch != '\t')
            count++;
    }

    line++;
    fclose(fp);

    printf("data4.txt统计结果：\n");
    printf("行数:%20d\n", line);
    printf("字符数（不计空白符）：%3d\n", count);

    system("pause");

    return 0;
}

任务5

源代码：

#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.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);

    system("pause");

    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\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("D:\\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,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[cnt] = st[i];
            cnt++;
        }
        else
            strcpy(st[i].result,"未通过");

    }
    return cnt;
}

void write(STU st[], int n) {
    int i;
    FILE *fp;
    fp=fopen("list_pass.txt", "w");
    if(!fp){
        printf("fail to open file to write\n");
        return;
    }
    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结果\n");
    for(i=0;i<n;i++){
        fprintf(fp,"%ld\t%s\t%.2\t\t%.2f\t\t%.2f\t%s\t", st[i].id, st[i].name, st[i].objective,
            st[i].subjective, st[i].sum, st[i].result);
    }
        fclose(fp);
}

任务6

源代码：

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

#define N 80
#define M 100

typedef struct{
    char info[M];
}stduent;

int main(){
    int count=0;
    int t[N]={0};
    int i,j,idx,repeat;

    FILE *fp=fopen("D:\\软件信息\\实验7数据文件及部分代码_gbk\\实验7数据文件及部分代码_gbk\\list.txt", "r");
    if(fp==NULL){
        printf("打开失败");
        return 1;
    }
    stduent stus[N];
    while(fgets(stus[count].info,M,fp) != NULL && count < N)
    {
        stus[count].info[strcspn(stus[count].info,"\n")]='\0';
    if(strlen(stus[count].info) > 0)
        count++;
    }
    fclose(fp);

    srand((unsigned)time(NULL));
    int winidx[5];
    for(i=0;i<5;i++){
        do{
            repeat = 0;
            idx = rand()%count;
            for(j=0;j<i;j++)
                if(winidx[j]==idx){
                    repeat = 1;
                    break;
                }
        }while(repeat);
        winidx[i]=idx;
}
    printf("--------中奖名单-------\n");
    for(i=0;i<5;i++){
        puts(stus[winidx[i]].info);
    }
    printf("--------保存在文件------\n");
    char name[N];
    printf("输入文件名:");
    scanf("%s",name);
    FILE *fw=fopen(name, "w");
    if(fw == NULL){
        printf("创建失败");
        return 2;
    }
    for(i=0;i<5;i++)
        fprintf(fw,"%s\n", stus[winidx[i]].info);
    fclose(fw);
    printf("保存成功！\n");
    system("pause");
    return 0;
}