实验7

实验任务4

源代码

#include <stdlib.h>
#include<stdio.h>
int main()
{
    FILE *fp;
    char ch;
    int line = 0, charcnt = 0;
    fp = fopen("data4.txt","r");
    if(fp == NULL)
    {
        printf("无法打开文件\n");
        return 1;
    }
    while((ch = fgetc(fp)) != EOF)
    {
        if(ch == '\n')
            line++;
        if(ch != ' ' && ch != '\n' && ch != '\t')
            charcnt++;
    }
    fclose(fp);
    printf("data4.txt统计结果:\n");
    printf("行数:        %d\n",line);
    printf("字符数(不计空白符): %d\n",charcnt);
	system("pause");
    return 0;
}

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实验任务5

源代码

#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("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, "不通过");
        }
    }
    return cnt;
}


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

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实验任务6

源代码

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
#define N 80
typedef struct
{
    char id[20];
    char name[20];
    char cls[30];
}Stu;

int main()
{
    FILE *fp;
    Stu arr[N], win[5];
    int vis[80]={0};
    int i, idx, cnt=0;
    char filename[30];
    fp = fopen("list.txt","r");
    for(i=0;i<80;i++)
    {
        fscanf(fp,"%s%s%s",arr[i].id,arr[i].name,arr[i].cls);
    }
    fclose(fp);
    srand((unsigned int)time(NULL));
    while(cnt < 5)
    {
        idx = rand()%80;
        if(vis[idx]==0)
        {
            vis[idx]=1;
            win[cnt] = arr[idx];
            cnt++;
        }
    }
    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("----------保存到文件----------\n");
    printf("输入文件名：");
    scanf("%s",filename);
    fp = fopen(filename,"w");
    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");
    system("pause");
    return 0;
}

 

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