实验7

任务4

源代码

#include <stdio.h>

#define N 80
#define M 100

int a = 0; 
int n = 0;

void read() {
    char ch;
    FILE *fp = fopen("C:\\Users\\wsj\\Desktop\\实验7数据文件及部分代码\\data4.txt", "r");
    if (fp == NULL) {
        perror("Unable to open file");
        return;
    }

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

    if (ch != '\n') {
        a++;
    }
    fclose(fp);
}

int main() {
    read(); 
    printf("data4.txt统计结果\n");
    printf("行数: %17d\n", a);
    printf("字符数(不计空白符):%d\n", n);
    return 0;
}

运行结果

 

任务5

源代码

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

#define N 10

typedef struct {
    long id;            // 准考证号
    char name[20];      // 姓名
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char result[10];    // 考试结果
} STU;

// 函数声明
void read(STU st[], int n);
void write(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);

int main() {
    STU stu[N], stu_pass[N];
    int cnt;
    double pass_rate;

    printf("从文件读入%d个考生信息...\n", N);
    read(stu, N);

    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);

    printf("\n通过考试的名单:\n");
    output(stu, N);   // 输出所有考生完整信息到屏幕
    write(stu, N);    // 输出考试通过的考生信息到文件

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

    return 0;
}

// 把所有考生完整信息输出到屏幕上
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
void output(STU st[], int n) {
    int i;

    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结果\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
}

// 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 read(STU st[], int n) {
    int i;
    FILE *fin;

    fin = fopen("examinee.txt", "r");
    if (!fin) {
        printf("fail to open file\n");
        return;
    }

    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
    }

    fclose(fin);
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
void write(STU st[], int n) {
    FILE *fp;
    int i;

    fp=fopen("list_pass.txt","w");
    if(!fp) {
        printf("fail to open file to write\n");
        return;
    }
    fprintf(fp,"准考证号          姓名         客观题得分      操作题得分      总分                结果\n");
    for (i = 0; i < N; i++)
    if(st[i].sum>=60)
        fprintf(fp,"%-20ld%-10s\t%-20.2f%-20.2f%-20.2f%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);


    fclose(fp);
}
int process(STU st[], int n, STU st_pass[]) {
    int i,t=0;

    for(i=0;i<N;i++){
        st[i].sum=st[i].objective +st[i].subjective ;
        if(st[i].sum>=60){
            strcpy(st[i].result,"通过");
            st_pass[t].id=st[i].id;
            strcpy(st_pass[t].name,st[i].name);
            st_pass[t].objective=st[i].objective;
            st_pass[t].subjective=st[i].subjective;
            st_pass[t].sum=st[i].sum;
            strcpy(st_pass[t].result,st[i].result);
            t++;
        }
        else
        strcpy(st[i].result,"不通过");
    }
    return t;
}

运行结果

 

 

任务六

源代码

#include <stdio.h>
#include <stdlib.h>
#include <time.h> 
#define N 100
#define M 100 

typedef struct {
    int id;      
    char name[N];
    char ban[N];     
} stu;
void read(stu s[],int n);
void write(stu s[],int n);
void process(stu s[],int n,stu ss[]);
void output(stu ss[],int n);

int main(){
    stu s[N],ss[N];
int i;
int n;
n=5;
read(s,N);
process(s,n,ss);
printf("----------随机抽点名单----------\n");
 
output(ss,n);
printf("\n");
printf("----------保存到文件----------\n");
write(ss,n); 
    
    return 0;
}
void read(stu s[],int n) 
{
    int i;
      FILE *fp;

    fp = fopen("list.txt", "r");
    if (!fp) {
          printf("fail to open file\n");
        return;
    }

    while (!feof(fp)) {
        for (i = 0; i < n; i++)
            fscanf(fp, "%20d%10s%20s\n",&s[i].id,s[i].name,s[i].ban);

    }

    fclose(fp);
       
}
void output(stu s[],int n){
    int i;
    for(i=0;i<n;i++)
    {
        printf("%-20d%-10s%20s\n",s[i].id,s[i].name,s[i].ban);
     } 
}

void process(stu s[], int n, stu ss[]) {
    int i, j;
    int used[N] = {0}; 
    srand((unsigned)time(NULL)); 

    for (i = 0; i < n; i++) {
        do {
            j = rand() % 79; 
        } while (used[j]); 
        ss[i] = s[j]; 
        used[j] = 1; 
    }
}
    

void write(stu ss[],int n){
    char x[N];
    int i;
    printf ("输入文件名:");
    scanf("%s",x);
    FILE *fp;
    fp=fopen(x,"w");
    if(fp==NULL){
        
     printf("fail");    
    return;
}
    for(i=0;i<n;i++)
    fprintf(fp,"%-20d%-10s%-20s\n",ss[i].id,ss[i].name,ss[i].ban);
    printf("保存成功!");
    fclose(fp);
    
}

 

运行结果

选做

源代码

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 100
#define M 100 

typedef struct {
    int id;      
    char name[N];
    char ban[N];     
} stu;
void read(stu s[],int n);
void write(stu s[],int n);
void process(stu s[],int n,stu ss[]);
void output(stu ss[],int n);

int main(){
    stu s[N],ss[N];
int i;
int n;
n=5;
read(s,N);
process(s,n,ss);
printf("----------20241228抽点名单----------\n");
 
output(ss,n);
printf("\n");

write(ss,n); 
    
    return 0;
}
void read(stu s[],int n) 
{
    int i;
      FILE *fp;

    fp = fopen("list.txt", "r");
    if (!fp) {
          printf("fail to open file\n");
        return;
    }

    while (!feof(fp)) {
        for (i = 0; i < n; i++)
            fscanf(fp, "%20d%10s%20s\n",&s[i].id,s[i].name,s[i].ban);

    }

    fclose(fp);
       
}
void output(stu s[],int n){
    int i;
    for(i=0;i<n;i++)
    {
        printf("%-20d%-10s%20s\n",s[i].id,s[i].name,s[i].ban);
     } 
}

void process(stu s[], int n, stu ss[]) {
   int i, j;
   stu t;
    int used[N] = {0}; 
    srand((unsigned)time(NULL)); 

    for (i = 0; i < n; i++) {
        do {
            j = rand() % 79; 
        } while (used[j]); 
        ss[i] = s[j]; 
        used[j] = 1; 
    }

    for(i = 0; i < n - 1; i++) {
        for(j = 0; j < n - 1 - i; j++) {
            if(ss[j].id > ss[j + 1].id) {
                t = ss[j];
                ss[j] = ss[j + 1];
                ss[j + 1] = t;
            }
        }
    }
}
    

void write(stu ss[],int n){
    char filename[N];
    int i;
    time_t t;
    struct tm *tm;
    time(&t);
    tm = localtime(&t);

  
    strftime(filename, N, "%Y%m%d.txt", tm);

    FILE *fp = fopen(filename, "w");
    if (fp == NULL) {
        printf("fail");
        return;
    }

    for (i = 0; i < n; i++) {
        fprintf(fp, "%-20d%-15s%-20s\n", ss[i].id, ss[i].name, ss[i].ban);
    }
    printf("文件保存成功!");
    fclose(fp);
}

运行结果

 

posted @ 2024-12-29 21:53  wsj1204  阅读(9)  评论(0编辑  收藏  举报