实验七

#include <stdio.h>
#define N 10
#define M 100


int main(){
    char x[N][M];
    int i,j,cnt=0,count=0;
    FILE *fp;

    fp = fopen("data4.txt", "r");
    if(!fp) {
        printf("fail to open file to read\n");
        return;
    }

     for (i = 0; i < N && fgets(x[i], M, fp) != NULL; ++i) {
        count++;
    }

    for (i = 0; i < count; ++i) {
        j = 0;
        while (x[i][j] != '\0') {
            char ch = x[i][j];

            if (ch != ' ' && ch != '\n' && ch != '\r') {
                cnt++;
            }
            j++;
        }
    }

    fclose(fp);

    printf("%s\n","data4.txt统计结果：");
    printf("行数：%-20d\n",count);
    printf("字符数（不计空白符）:%-20d\n",cnt);

    return 0;
}

#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 s[], int n) {
    int i;
    FILE *fin;
    
    fin=fopen("list_pass.txt","w");
    if(!fin){
        printf("fail to open file\n");
        return;
    }
    fprintf(fin,"%-20s%-20s%-20s%-20s%-20s%-20s\n","准考证号","姓名","客观题得分","操作题得分","总分","结果");
    for(i=0;i<n;i++){
        if(strcmp(s[i].result,"通过")==0){
            fprintf(fin,"%-20s%-20s%-20s%-20s%-20s%-20s\n",s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
        }
    }
    fclose(fin);
    
}

// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
    int i,j=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[j++]=st[i];
        }
        if(st[i].sum<60){
            strcpy(st[i].result,"未通过");
        }
    }
    return j;
}

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

typedef struct{
    char id[20];
    char name[20];
    char class[20];
}student;

void read(student s[N]);
void random(student s[N]);

int main(){
    student s[N];
    read(s);
    random(s);
    
    return 0;
}

void read(student s[N]){
    int i,number;
    FILE *fp;
    fp=fopen("list.txt","r");
    if(!fp){
        printf("fail to open file\n");
        return;
    }
    i=0;
    while(!feof(fp)){
        number=fscanf(fp,"%s%s%s",s[i].id,s[i].name,s[i].class);
        if(number!=3)
            break;
        i++;
    }
    fclose(fp);
}

void random(student s[N]){
    FILE *fin;
    int i,j,m,k;
    int x[5];
    char file[20];
    srand(time(NULL));
    
    for(i=0,k=0;k<5;i++){
        m=rand()%80;
        int ans=0;
        for(j=0;j<k;j++){
            if(m==x[j])
               ans=1;
               break;
        }
        if(!ans){
            x[k++]=m;
        }
    }
    printf("-----随机点名-----\n");
    for(i=0;i<5;i++)
        printf("%s %s %s \n",s[x[i]].id,s[x[i]].name,s[x[i]].class);
    printf("-----保存到文件-----\n");
    printf("输入文件名：");
    scanf("%s",&file);
    fin=fopen(file,"w");
    if(!fin){
        printf("fail to open file");
        return;
    }
    for(i=0;i<5;i++){
        fprintf(fin,"%s %s %s \n",s[x[i]].id,s[x[i]].name,s[x[i]].class);
    }
    fclose(fin);
    printf("保存成功!");
}