李湘楠实验7

//test4.c

#include<stdio.h>

int main() {
    char ch;
    int i;
    int count= 0 ;
    
    FILE *fp;
    fp = fopen("data4.txt", "r");

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

    while((ch = fgetc(fp)) != EOF) {
        if(ch != ' ' && ch != '\n' && ch != '\t' && ch!='\v')
            count++;
    }

    fclose(fp);

    printf("data4.txt中共包含字符数（不计空白符）: %d\n", count);

    return 0;
}

//test5.c

#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,"合格");
        else
            strcpy(s[i].level,"不合格"); 
    }
    
}

//test6.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 5
#define M 80

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

int main(){
    int i,n;
    STU s[M],a[N];

    FILE *fp,*ran;
    fp = fopen("list.txt","r");
    ran = fopen("lucky.txt","w");

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

    while(!feof(fp)){
        for (i = 0; i < M; i++)
            fscanf(fp, "%ld %s %s", &s[i].id, s[i].name, s[i].banji);
    }

    srand(time(NULL));

    for(i=0;i<N;++i){
        n=rand()%M;
        a[i]=s[n];
    }
    fclose(fp);

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

    for(i=0;i<N;i++){
        printf("%ld\t%s\t%s\n",a[i].id,a[i].name,a[i].banji);
        fprintf(ran,"%ld\t%s\t%s\n",a[i].id,a[i].name,a[i].banji);
    }
    fclose(ran);

    return 0;
}

//test6.c  改进

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 5
#define M 80

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

int main(){
    int i,n,j;
    STU s[M],a[N];
    time_t timep;
    char name[256]={0};

    FILE *fp,*ran;
    fp = fopen("list.txt","r");
    ran = fopen("lucky.txt","w");

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

    while(!feof(fp)){
        for (i = 0; i < M; i++)
            fscanf(fp, "%ld %s %s", &s[i].id, s[i].name, s[i].banji);
    }

    srand(time(NULL));

    for(i=0;i<N;++i){
        n=rand()%M;
        if(i!=0){
            for(j=0;j<i;){
            if(s[n].id==a[j].id)
                n=rand()%80;
            else
                j++;
            }
        }     
        a[i]=s[n];
    }
    fclose(fp);

    time(&timep);
    strftime(name,sizeof(name),"%Y.%m.%d %H-%M-%S.txt",localtime(&timep));
    ran = fopen(name, "w");

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

    for(i=0;i<N;i++){
        printf("%ld\t%s\t%s\n",a[i].id,a[i].name,a[i].banji);
        fprintf(ran,"%ld\t%s\t%s\n",a[i].id,a[i].name,a[i].banji);
    }
    fclose(ran);

    return 0;
}