实验六

一、

#include <stdio.h>
#include <stdlib.h>
int main()
{
    char cr;
    FILE *fp;
    long count;
    if((fp=fopen("data4.txt","r"))==NULL)
    {
        printf("Can't open file.\n");
        exit(1);
    }
    count = 0;
    while((cr=fgetc(fp))!=EOF)
    {
        if(cr!=' '&&cr!='\n'&&cr!='\t')
        count++;
    }
    fclose(fp);
    printf("date4.txt中共有 %ld 个字符。\n",count);
    return 0;
}

 

 

 二、

#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) {
    // 补足代码
    // ×××
    int i,k;
    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(int j=0;j<n-1;j++){
        if(s[j+1].sum>s[j].sum){
            t=s[j+1];
            s[j+1]=s[j];
            s[j]=t;}
    }
    }
    for(k=0;k<n;k++){
        if(k<=n*0.1-1)
        strcpy(s[k].level,"优秀");
        else if(k>=n*0.1-1&&k<=n*0.5-1)
        strcpy(s[k].level,"合格");
        else
        strcpy(s[k].level,"不合格");
            
    }
}

 

 

 

 三、

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
typedef struct {
    int num;
    char name[20];
    char clas[20];
}STU;
int main() {
    int i;
    FILE *fp1, *fp2;
    STU s[80];
    STU lucky[5];
    fp1 = fopen("list.txt", "r");
    fp2 = fopen("lucky.txt", "w");
    if (fp1==NULL)
    {
        printf("open error!");
        return 1;
    }
    for (i = 0; i < 80; i++)
    {
        fscanf(fp1,"%d %s %s",&s[i].num,s[i].name,s[i].clas);
    }
      fclose(fp1);
    srand((unsigned int)time(NULL));
    
    
    for (i = 0; i < 5; i++)
    {
        lucky[i].num = 204942000 + (rand() % 80 + 1);
    }
    for (i = 0; i< 5; i++)
    {
        for (int k = 0; k < 80; k++)
        {
            if (s[k].num == lucky[i].num)
            {
                lucky[i] = s[k];
            }
        }
    }
    for (i = 0; i < 5; i++)
    {
        printf("%d\t%s\t%s\n", lucky[i].num, lucky[i].name, lucky[i].clas);
        fprintf(fp2, "%d\t%s\t%s\n", lucky[i].num, lucky[i].name, lucky[i].clas);
    }
    fclose(fp2);
    return 0;
    }

 

 选做：

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
typedef struct {
    int num;
    char name[20];
    char clas[20];
}STU;
int main() {
    int i;
    FILE *fp1, *fp2;
    STU s[80];
    STU lucky[5];
    time_t timep;
    struct tm *p;
    char name[256] = {0};
    time(&timep);
    p = localtime(&timep);
    sprintf(name, "%d.%d.%d.txt",1900+p->tm_year,1+p->tm_mon,p->tm_mday);
    fp1 = fopen("list.txt", "r");
    fp2 = fopen(name ,"w");
    if (fp1==NULL)
    {
        printf("open error!");
        return 1;
    }
    for (i = 0; i < 80; i++)
    {
        fscanf(fp1,"%d %s %s",&s[i].num,s[i].name,s[i].clas);
    }
      fclose(fp1);
    srand((unsigned int)time(NULL));
    
    
    for (i = 0; i < 5; i++)
    {
        lucky[i].num = 204942000 + (rand() % 80 + 1);
    }
    for (i = 0; i< 5; i++)
    {
        for (int k = 0; k < 80; k++)
        {
            if (s[k].num == lucky[i].num)
            {
                lucky[i] = s[k];
            }
        }
    }
    for (i = 0; i < 5; i++)
    {
        printf("%d\t%s\t%s\n", lucky[i].num, lucky[i].name, lucky[i].clas);
        fprintf(fp2, "%d\t%s\t%s\n", lucky[i].num, lucky[i].name, lucky[i].clas);
    }
    fclose(fp2);
    return 0;
    }