实验6

task4

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

int main(){
    FILE *fp;
    int count=0;
    fp=fopen("data4.txt","r");
    
    if(fp==NULL){
        printf("fail to open the file");
        return 1;
    }
    
    char ch;
    
    while((ch=fgetc(fp))!=EOF){
        if(ch!=' '&&ch!='\n'&&ch!='\t')
            count++;
    }
    fclose(fp);
    printf("data4.txt中共包含字符数（不计空白符）：%d",count);
    system("pause");
    return 0;
}

 task5

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

#define N 10

typedef struct {
    long int id;
    char name[20];
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;
    char level[10];
} STU;

// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);

int main() {
    STU stu[N];

    printf("从文件读入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<=60)\n", N);
    input(stu, N);

    printf("\n对考生信息进行处理: 计算总分，确定等级\n");
    process(stu, N);

    printf("\n打印考生完整信息, 并保存到文件中");
    output(stu, N);

    system("pause");
    return 0;
}

// 从文本文件examinee.txt读入考生信息:准考证号，姓名，客观题得分，操作题得分
void input(STU s[], int n) {
    int i;
    FILE *fin;

    fin = fopen("examinee.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }

    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective);
    }

    fclose(fin);
}

// 输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
// 不仅输出到屏幕上，还写到文本文件result.txt中
void output(STU s[], int n) {
    FILE *fout;
    int i;
    
    // 输出到屏幕
    printf("\n");
    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等级\n");
    for (i = 0; i < n; i++)
        printf("%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].level);
    
    // 保存到文件 
    fout = fopen("result.txt", "w");
    if (!fout) {
        printf("fail to open or create result.txt\n");
        exit(0);
    }
    
    fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n");

    for (i = 0; i < n; i++)
        fprintf(fout, "%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].level);

    fclose(fout);
}

// 对考生信息进行处理：计算总分，排序，确定等级
void process(STU s[], int n) {
    // 补足代码
    int i,j;
    STU t;
    for(i=0;i<n;i++)
    s[i].sum=s[i].objective+s[i].subjective;
    for(j=0;j<n;j++)
    for(i=0;i<n-j-1;i++)
    {
        if(s[i].sum<s[i+1].sum)
        {
            t=s[i+1];
            s[i+1]=s[i];
            s[i]=t;
        }
    }
    for(i=0;i<n;i++)
    {
        if(i<0.1*(n-1))
        strcpy(s[i].level,"优秀");
        if(i>=0.1*(n-1)&&i<0.5*(n-1))
        strcpy(s[i].level,"合格");
        if(i>=0.5*(n-1))
        strcpy(s[i].level,"不合格");
    }
}

 task6

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

 typedef struct 
 {
 long int no;
 char name[20];
 char clas[100];
} STU;


int main()
{
    STU x[80];
    STU lucky[5];
    FILE *fp;
    fp = fopen("list.txt", "r");
    
    if(fp == NULL) 
    {
        printf("fail to open file\n");
        return 1;
    }
    
    while(!feof(fp))
    {
        for (int i = 0; i < 80; i++)
        fscanf(fp, "%ld%s%s", &x[i].no,x[i].name, x[i].clas);
    }
    fclose(fp);
    
    FILE *fp2;
    
    fp2 = fopen("lucky.txt", "w");
    if(fp2 == NULL) 
    {
        printf("fail to open file\n");
        return 1;
    }
    
    srand ( time ( NULL ) ) ;  
    for(int i = 0; i < 5; i++)
        lucky[i].no=204942000+rand()%50+1;
    
    for (int i = 0; i < 5; i++)
    {
        for (int j = 0; j < 80; j++)
        {
            if (lucky[i].no == x[j].no)
                lucky[i] = x[j];
        }
    }
    
    for(int i = 0; i < 5; ++i)
    {
        fprintf(fp2,"%ld\t%s\t%s\n", lucky[i].no, lucky[i].name,lucky[i].clas);
        printf("%ld\t%s\t%s\n", lucky[i].no, lucky[i].name,lucky[i].clas);
    }
    
    fclose(fp2);
    
    system("pause");
    return 0;
}