实验七

task4

#include <stdio.h>
 int main() {
     FILE *fp;
     fp=fopen("data4.txt","r");
     int lines = 0, chars = 0;
     int i;
     char s[100];

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

    while (fgets(s, 100, fp)) {
         lines++;
         i = 0;
         while (s[i] != '\0') {
             if (s[i] != ' ' && s[i] != '\t' && s[i] != '\n') {
                 chars++;
             }
             i++;
         }
    }

     fclose(fp);
     printf("data4.txt统计结果:\n");
     printf("行数: %d\n", lines);
    printf("字符数(不计空白符): %d\n", chars);
     return 0;
 }

 task5

#include <stdio.h>
#include <string.h>
#define _CRT_SECURE_NO_WARNINGS
#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...\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);
    write(stu, N);

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

void write(STU s[], int n) {
    int i;
    FILE *fin;

    fin=fopen("D:\C语言任务\list.txt", "w");
    if (!fin) {
        printf("fail to open file\n");
        return;
    }

    fprintf(fin,"准考证号\t姓名\t\t客观题得分\t\t操作题得分\t\t总分\t\t结果\n");
    for (i = 0; i < n; i++) {
        if(s[i].sum>=60)
            fprintf(fin,"%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].result);
    }
    fclose(fin);
}
int process(STU st[], int n, STU st_pass[]) {
    int passnum=0;
    int i;
    int j=0;
    for(i=0;i<n;i++) {
        st[i].sum=st[i].subjective+st[i].objective;
        if(st[i].sum>=60) {
            strcpy(st[i].result,"通过");

            st_pass[j]=st[i];
            j++;
            passnum++;
        }
        else
            strcpy(st[i].result,"不通过");

    }
    return passnum;


}

 task6

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

#define N 5
#define M 80

struct student
{
    char id[10];
    char name[10];
    char num_class[30];
}STU;

int main()
{
    struct student x[M], y[N];
    char name_file[50];
    char filePath[200];
    int i=0,j=0, k,number;
    FILE *fp;
    srand(time(NULL));

    printf("------------------20250525中奖名单-------------------\n");

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

    if(!fp)
    {
        printf("fail to open file to read\n");
        return 0;
    }
    
     while(!feof(fp)) 
     {
        number = fscanf(fp, "%s%s%s", x[i].id, x[i].name,x[i].num_class);
        if(number != 3)
            break;
        i++;
    }
     fclose(fp);
    

    while(j<5)
    {
        k=rand()%79;
        y[j++]=x[k];
        printf("%-10s%-10s%-30s\n", x[k].id, x[k].name, x[k].num_class);
    }

    printf("输入保存文件名：");
    scanf("%s",name_file);
    sprintf(filePath, "list.txt", name_file);

    fp=fopen(filePath,"w");
    
    if(fp==NULL)
    {
        printf("fail to open file to write\n");
        return 0;
    }

    for(j=0;j<N;++j)
    {
        fprintf(fp,"%-10s%-10s%-30s\n",y[j].id, y[j].name,y[j].num_class);
    }
    fclose(fp);

    return 0;
}