实验6

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 80
int main()
{
    int i,count=0;
    char x[N];
    FILE *fp;
    
    fp = fopen("data4.txt","r");
    if(fp==NULL)
    {
        printf("fail to open the file\n");
        return 1;
    }
    
    fread(x,N,1,fp);
    
    for(i = 0;x[i]!='\0';i++)
        if(x[i]!=' '&&x[i]!='\n'&&x[i]!='\t')
            count++;
            
    printf("data4.txt中共包含字符数（不包含空白符）：%d\n",count);
    
    fclose(fp);
    return 0;    
    
}

#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);

    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) {
    int i,j;
    STU t;
    for(i = 0;i < n;i++)
        s[i].sum = s[i].objective + s[i].subjective;
    
    for(i = 0;i < n-1;i++)
        for(j = 0;j < n-1-i;j++)
            if(s[j].sum < s[j+1].sum)
            {
                t = s[j];
                s[j] = s[j+1];
                s[j+1] = t;
            }
    
    for(i = 0;i < n;i++)
    {
        if(i < n*0.1)
            strcpy(s[i].level,"优秀");
        else if(i >= n*0.1&&i < n*0.5)
            strcpy(s[i].level,"及格");
        else
            strcpy(s[i].level,"不及格");
    }
        
}

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

#define N 80

typedef struct
{
    long int id;
    char name[20];
    char cla[20];
}STU;

void input(STU s[],int n);
void output(STU s[],int n);

int main()
{
    STU stu[N];
    
    input(stu,N);
    output(stu,5);
    
    return 0;
}

void input(STU s[],int n)
{
    int i;
    FILE *fin;
    
    fin = fopen("list.txt","r");
    if(fin == NULL)
    {
        printf("fail to open the file\n");
        exit(0);
    }
    
    while(!feof(fin))
        for(i = 0;i < n;i++)
            fscanf(fin,"%ld %s %s",&s[i].id,s[i].name,s[i].cla);
            
    fclose(fin);
        
}

void output(STU s[],int n)
{
    int i,num;
    FILE *fout;
    
    fout = fopen("lucky.txt","w");
    if(fout == NULL)
    {
        printf("fail to create the lucky.txt\n");
        exit(0);
    }
    
    srand(time(NULL));
    for(i = 0;i < n;i++)
    {
        num = rand()%N;
        printf("%-20ld %-10s %-20s\n",s[num].id,s[num].name,s[num].cla);
        fprintf(fout,"%-20ld %-10s %-20s\n",s[num].id,s[num].name,s[num].cla);
    }
    fclose(fout);
}