实验7

task4

#include<stdio.h>
int main(){
    char c;
    int a=0,b=0,d=0,e=0,s=0;
    while((c=getchar())!=EOF){
        if(c>='a'&&c<='z'||c>='A'&&c<='Z')
        a++;
        else if(c>='0'&&c<='9')
        b++;
        else if(c==' '||c=='\n'||c=='\t')
        d++;
        else
        e++;
    }
    s=a+b+e;
    printf("data4.txt中共包含字符数（不计空白符）：%d",s);
    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);

    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");
    }
}

task6

#include <stdio.h>
#include <time.h>
#define N 20
#define M 80
typedef struct
{
    char no[N];
    char name[N];
    char classname[N];
}STU;
int main()
{
    int i=0,flag[M]={0},k;
    STU a[M],b[5];
    FILE *fp,*ptr;
    
    fp=fopen("list.txt","r");
    ptr=fopen("lucky.txt","w");
    
    if(fp==NULL)
    {
        printf("fail to open\n");
        return 1;
    }
    
    if(ptr==NULL)
    {
        printf("fail to open\n");
        return 1;
    }
    
    while(!feof(fp))
    {
        fscanf(fp,"%s%s%s",a[i].no,a[i].name,a[i].classname);
        i++;
    }
    srand((unsigned)time(NULL));
    for(i=0;i<5;)
    {
        k=rand()%80;
        if(flag[k]==0)
            b[i++]=a[k];
        flag[k]=1;
        
        
    }
    for(i=0;i<5;i++)
    {
        printf("%-20s%-20s%-20s\n",b[i].no,b[i].name,b[i].classname);
        fprintf(ptr,"%-20s%-20s%-20s\n",b[i].no,b[i].name,b[i].classname);
    }
    fclose(fp);
    fclose(ptr);
    return 0;
}