实验7

实验任务4

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>


int count();
int countChars();

int main()
{
    int linecount = 0;
    int charcount = 0;
    printf("data4.txt统计结果：\n");

    linecount = count();
    charcount = countChars();
    printf("行数:                 %d\n", linecount);
    printf("字符数(不计空白符):   %d\n",charcount);
    system("pause");
    return 0;
}

int count()
{
    int line_count = 0;
    int char_count = 0;
    int c;

    FILE* fp = fopen("data4.txt", "r");
    if (!fp)
    {
        printf("fail to open file to read\n");
        return line_count;
    }

    while ((c = fgetc(fp)) != EOF) 
    {
        if (c == '\n') {
            line_count++;
        }
    }

    line_count++;

    fclose(fp);
    return line_count;

}
int countChars()
{
    int char_count = 0;
    int c;

    FILE* fp = fopen("data4.txt", "r");
    if (!fp)
    {
        printf("fail to open file to read\n");
        return char_count;
    }

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

    fclose(fp);
    return char_count;
}

 实验任务5

#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...\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);
    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("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) {
    FILE *fp;
    int i;
    fp=fopen("list_pass.txt","w");
    fprintf(fp,"准考证号  姓名  客观题得分  操作题得分   总分      结果\n");
    for(i=0;i<n;i++)
        if(strcmp(s[i].result,"通过")==0)
            fprintf(fp,"%-10d%-10s%-15.2f%-15.2f%-15.2f%-10s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
}

int process(STU st[], int n, STU st_pass[]) {
    int i,m=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[m++]=st[i];}
        else
            strcpy(st[i].result,"不通过");}
    return m;
}

 

 

实验任务6

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 80

typedef struct
{
    char id[N];
    char name[N];
    char classnum[N];
}STU;


int main()
{
    STU st[N], lucky[5];
    int i=0,number;
    int lucky_index;
    int flag[N] = { 0 };
    char filename[N];

    FILE* fp1;

    fp1 = fopen("list.txt", "r");
    if (fp1 == NULL)
    {
        printf("fail to open file to read\n");
        return 1;
    }
    while (!feof(fp1)) 
    {
        number = fscanf(fp1, "%s%s%s", st[i].id, st[i].name, st[i].classnum);
        if (number != 3)
            break;
        i++;
    }
    
    fclose(fp1);
    
    printf("------------中奖名单------------\n");

    srand(time(NULL));
    for (i = 0; i < 5; ++i)
    {
        lucky_index = rand() % N;
        if (flag[lucky_index] == 0)
        {
            lucky[i] = st[lucky_index];
            printf("%-10s%-20s%-20s\n", st[lucky_index].id, st[lucky_index].name, st[lucky_index].classnum);
            flag[lucky_index] = 1;
        }
        else
            i--;
    }
    printf("------------保存到文件------------\n");
    printf("输入文件名：");
    scanf("%s", filename);

    FILE* fp;
    fp = fopen(filename, "wb");
    if (fp == NULL)
    {
        printf("fail to open file to read\n");
        return 1;
    }
    for (i = 0; i < 5; i++)
    {
        fprintf(fp, "%-10s%-20s%-20s\n", lucky[i].id, lucky[i].name, lucky[i].classnum);
    }
    fclose(fp);
    printf("保存成功\n");

    return 0;
}