实验7

实验任务4

程序源码

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

int main() {
    int i;
    FILE *fp;
    char ch;
    fp= fopen("C:\\Users\\47068\\Desktop\\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')
        i++;
        
    }
    printf("data4.txt中共包含%d个字符数",i);
    
    fclose(fp);
    
    return 0;
}

运行结果

实验任务5

程序源码

#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;i++)
    {
        for(j=0;j<n-i-1;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");
}
}

 运行结果

实验6

程序源码

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 10
#define M 80

typedef struct{
    long int id;
    char name[M];
    char classname[M];
}STU;

int main(){
    STU s[M];
    int i;
    int a[N];
    
    FILE *fin;
    fin=fopen("C:\\Users\\47068\\Desktop\\list.txt","r");
    if(fin==NULL){
        printf("fail to open file\n");
        return 1;
    }
    while(!feof(fin)){
        for(i=0;i<M;i++)
            fscanf(fin,"%ld %s %s",&s[i].id,s[i].name,s[i].classname);
    }
    srand(time(NULL));
    for(i=0;i<N;i++){
        a[i]=1+rand()%80;
    }
    fclose(fin);
    
    FILE *fout;
    
    for(i=0;i<N;i++){
        printf("%ld\t\t%s\t\t%s\n",s[a[i]].id,s[a[i]].name,s[a[i]].classname);
    }
    
    fout=fopen("lucky.txt","w");
    if(!fout){
        printf("fail to open or creat lucky.txt\n");
        return 1;
    }
    for(i=0;i<N;i++)
        fprintf(fout,"%ld\t\t%s\t\t%s\n",s[a[i]].id,s[a[i]].name,s[a[i]].classname); 
    fclose(fout);
}

运行结果